diff --git a/Avalonia.sln.DotSettings b/Avalonia.sln.DotSettings
index 7060f4a62a..25d62b0494 100644
--- a/Avalonia.sln.DotSettings
+++ b/Avalonia.sln.DotSettings
@@ -37,4 +37,5 @@
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=StaticReadonly/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="AaBb" /&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=TypeParameters/@EntryIndexedValue">&lt;Policy Inspect="False" Prefix="T" Suffix="" Style="AaBb" /&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=TypesAndNamespaces/@EntryIndexedValue">&lt;Policy Inspect="False" Prefix="" Suffix="" Style="AaBb" /&gt;</s:String>
+	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EFeature_002EServices_002EDaemon_002ESettings_002EMigration_002ESwaWarningsModeSettingsMigrate/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Avalonia/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
\ No newline at end of file
diff --git a/build.ps1 b/build.ps1
index 57e2f80075..3672e82d3b 100644
--- a/build.ps1
+++ b/build.ps1
@@ -62,6 +62,8 @@ else {
     } else {
         ExecSafe { & $DotNetInstallFile -InstallDir $DotNetDirectory -Version $DotNetVersion -NoPath }
     }
+
+    $env:PATH="$DotNetDirectory;$env:PATH"
 }
 
 Write-Output "Microsoft (R) .NET Core SDK version $(& $env:DOTNET_EXE --version)"
diff --git a/build/SharedVersion.props b/build/SharedVersion.props
index 95556af160..a5c0aa1bea 100644
--- a/build/SharedVersion.props
+++ b/build/SharedVersion.props
@@ -16,7 +16,8 @@
     <PackageReleaseNotes>https://github.com/AvaloniaUI/Avalonia/releases</PackageReleaseNotes>
     <RepositoryType>git</RepositoryType>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)\avalonia.snk</AssemblyOriginatorKeyFile>
-    <SignAssembly>True</SignAssembly>
+    <SignAssembly>false</SignAssembly>
+    <DefineConstants Condition="$(SignAssembly) == true">$(DefineConstants);SIGNED_BUILD</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup Label="PackageIcon">
diff --git a/build/XUnit.props b/build/XUnit.props
index 53f524b8e9..a75e1bac86 100644
--- a/build/XUnit.props
+++ b/build/XUnit.props
@@ -13,6 +13,6 @@
   </ItemGroup>
   <PropertyGroup>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)\avalonia.snk</AssemblyOriginatorKeyFile>
-    <SignAssembly>True</SignAssembly>
+    <SignAssembly>False</SignAssembly>
   </PropertyGroup>
 </Project>
diff --git a/nukebuild/BuildTasksPatcher.cs b/nukebuild/BuildTasksPatcher.cs
index 0b650ca7cc..e3766ae23f 100644
--- a/nukebuild/BuildTasksPatcher.cs
+++ b/nukebuild/BuildTasksPatcher.cs
@@ -30,7 +30,10 @@ public class BuildTasksPatcher
                             {
                                 temp, typeof(Mono.Cecil.AssemblyDefinition).Assembly.GetModules()[0]
                                     .FullyQualifiedName,
-                                typeof(Mono.Cecil.Rocks.MethodBodyRocks).Assembly.GetModules()[0].FullyQualifiedName
+                                typeof(Mono.Cecil.Rocks.MethodBodyRocks).Assembly.GetModules()[0].FullyQualifiedName,
+                                typeof(Mono.Cecil.Pdb.PdbReaderProvider).Assembly.GetModules()[0].FullyQualifiedName,
+                                typeof(Mono.Cecil.Mdb.MdbReaderProvider).Assembly.GetModules()[0].FullyQualifiedName
+                                
                             },
                             SearchDirectories = new string[0],
                             OutputFile = output
diff --git a/samples/ControlCatalog.Desktop/ControlCatalog.Desktop.csproj b/samples/ControlCatalog.Desktop/ControlCatalog.Desktop.csproj
index 1a112d0d7d..c6405dabb6 100644
--- a/samples/ControlCatalog.Desktop/ControlCatalog.Desktop.csproj
+++ b/samples/ControlCatalog.Desktop/ControlCatalog.Desktop.csproj
@@ -3,6 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net461</TargetFramework>
+    <PlatformTarget>x64</PlatformTarget>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/ControlCatalog/App.xaml b/samples/ControlCatalog/App.xaml
index 9bac320c79..6aad44c0d5 100644
--- a/samples/ControlCatalog/App.xaml
+++ b/samples/ControlCatalog/App.xaml
@@ -12,6 +12,16 @@
     <Style Selector="TextBlock.h3">
       <Setter Property="FontSize" Value="12" />
     </Style>
+    <Style Selector="Label.h1">
+      <Setter Property="FontSize" Value="16" />
+      <Setter Property="FontWeight" Value="Medium" />
+    </Style>
+    <Style Selector="Label.h2">
+      <Setter Property="FontSize" Value="14" />
+    </Style>
+    <Style Selector="Label.h3">
+      <Setter Property="FontSize" Value="12" />
+    </Style>
     <StyleInclude Source="/SideBar.xaml"/>
   </Application.Styles>
 </Application>
diff --git a/samples/ControlCatalog/MainView.xaml b/samples/ControlCatalog/MainView.xaml
index bd5beafe29..488aa0535f 100644
--- a/samples/ControlCatalog/MainView.xaml
+++ b/samples/ControlCatalog/MainView.xaml
@@ -14,6 +14,7 @@
       <TabItem Header="Acrylic"><pages:AcrylicPage/></TabItem>
       <TabItem Header="AutoCompleteBox"><pages:AutoCompleteBoxPage/></TabItem>
       <TabItem Header="Border"><pages:BorderPage/></TabItem>
+      <TabItem Header="Label"><pages:LabelsPage/></TabItem>
       <TabItem Header="Button"><pages:ButtonPage/></TabItem>
       <TabItem Header="ButtonSpinner"><pages:ButtonSpinnerPage/></TabItem>
       <TabItem Header="Calendar"><pages:CalendarPage/></TabItem>
diff --git a/samples/ControlCatalog/Pages/LabelsPage.axaml b/samples/ControlCatalog/Pages/LabelsPage.axaml
new file mode 100644
index 0000000000..32c46f080d
--- /dev/null
+++ b/samples/ControlCatalog/Pages/LabelsPage.axaml
@@ -0,0 +1,42 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="400" d:DesignHeight="250"
+             x:Class="ControlCatalog.Pages.LabelsPage"
+             x:Name="_labelsPage">
+    <UserControl.Styles>
+        <Style Selector="Label">
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="Margin" Value="6,3,0,3"/>
+        </Style>
+        <Style Selector="TextBox">
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="Margin" Value="0,3,6,3"/>
+        </Style>
+        <Style Selector="CheckBox">
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="Margin" Value="0,3,6,3"/>
+        </Style>
+        <Style Selector="Button[IsDefault=true]">
+            <Setter Property="Background" Value="{DynamicResource HighlightBrush}"/>
+        </Style>
+    </UserControl.Styles>
+    <ScrollViewer VerticalScrollBarVisibility="Auto" 
+                  HorizontalScrollBarVisibility="Hidden">
+        <Grid HorizontalAlignment="Left" VerticalAlignment="Top" RowDefinitions="Auto,Auto,Auto,Auto,Auto,*" ColumnDefinitions="Auto,6,*" Width="246">
+            <Label Target="{Binding #firstNameEdit}" Grid.Row="0" Grid.Column="0">_First name</Label>
+            <TextBox Name="firstNameEdit" Grid.Column="2" Grid.Row="0" Text="{Binding FirstName}"></TextBox>
+            <Label Target="{Binding #lastNameEdit}" Grid.Row="1" Grid.Column="0">_Last name</Label>
+            <TextBox Name="lastNameEdit" Grid.Column="2" Grid.Row="1" Text="{Binding LastName}"></TextBox>
+            <Label Target="{Binding #bannedCheck}" Grid.Row="2" Grid.Column="0">_Banned</Label>
+            <CheckBox Name="bannedCheck" Grid.Column="2" Grid.Row="2" IsChecked="{Binding IsBanned}"></CheckBox>
+            <GridSplitter Grid.Column="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.RowSpan="3" >
+            </GridSplitter>
+            <StackPanel Grid.Column="0" Grid.Row="4" Grid.ColumnSpan="3" Orientation="Horizontal" HorizontalAlignment="Right">
+                <Button IsCancel="True" Command="{Binding #_labelsPage.DoCancel}">Cancel</Button>
+                <Button IsDefault="True" Command="{Binding #_labelsPage.DoSave}">Save</Button>
+            </StackPanel>
+        </Grid>
+    </ScrollViewer>
+</UserControl>
diff --git a/samples/ControlCatalog/Pages/LabelsPage.axaml.cs b/samples/ControlCatalog/Pages/LabelsPage.axaml.cs
new file mode 100644
index 0000000000..b8503d6ae6
--- /dev/null
+++ b/samples/ControlCatalog/Pages/LabelsPage.axaml.cs
@@ -0,0 +1,43 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using ControlCatalog.Models;
+using ReactiveUI;
+
+namespace ControlCatalog.Pages
+{
+    public class LabelsPage : UserControl
+    {
+        private Person _person;
+
+        public LabelsPage()
+        {
+            CreateDefaultPerson();
+            this.InitializeComponent();
+        }
+
+        private void CreateDefaultPerson()
+        {
+            DataContext = _person = new Person
+            {
+                FirstName = "John",
+                LastName = "Doe",
+                IsBanned = true,
+            };
+        }
+
+        private void InitializeComponent()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public void DoSave()
+        {
+            
+        }
+        public void DoCancel()
+        {
+            CreateDefaultPerson();
+        }
+    }
+}
diff --git a/samples/ControlCatalog/Pages/TextBoxPage.xaml b/samples/ControlCatalog/Pages/TextBoxPage.xaml
index 481a459159..8b07ac3f85 100644
--- a/samples/ControlCatalog/Pages/TextBoxPage.xaml
+++ b/samples/ControlCatalog/Pages/TextBoxPage.xaml
@@ -2,8 +2,8 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="ControlCatalog.Pages.TextBoxPage">
   <StackPanel Orientation="Vertical" Spacing="4">
-    <TextBlock Classes="h1">TextBox</TextBlock>
-    <TextBlock Classes="h2">A control into which the user can input text</TextBlock>
+    <Label Classes="h1">TextBox</Label>
+    <Label Classes="h2">A control into which the user can input text</Label>
 
     <StackPanel Orientation="Horizontal"
               Margin="0,16,0,0"
@@ -38,24 +38,24 @@
                  Text="Multiline TextBox with TextWrapping.&#xD;&#xD;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est." />
         <TextBox AcceptsReturn="True" Width="200" Height="125"
                  Text="Multiline TextBox with no TextWrapping.&#xD;&#xD;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est." />
-        
+
         <TextBox Classes="clearButton" Text="Clear Content" Width="200" FontWeight="Normal" FontStyle="Normal" Watermark="Watermark" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
       </StackPanel>
-        <StackPanel Orientation="Vertical" Spacing="8">
-            <TextBlock Classes="h2">resm fonts</TextBlock>
-            <TextBox Width="200" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
-                <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
-                <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-Italic.ttf?assembly=ControlCatalog#Source Sans Pro"/>
-                <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-*.ttf?assembly=ControlCatalog#Source Sans Pro"/>
-        </StackPanel>
-        
-        <StackPanel Orientation="Vertical" Spacing="8">
-            <TextBlock Classes="h2">res fonts</TextBlock>
-            <TextBox Width="200" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
-            <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
-            <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-Italic.ttf#Source Sans Pro"/>
-            <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-*.ttf#Source Sans Pro"/>
-        </StackPanel>
+      <StackPanel Orientation="Vertical" Spacing="8">
+        <Label Classes="h2" Target="{Binding #firstResMFont}">res_m fonts</Label>
+        <TextBox Width="200" x:Name="firstResMFont" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-Italic.ttf?assembly=ControlCatalog#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-*.ttf?assembly=ControlCatalog#Source Sans Pro"/>
+      </StackPanel>
+
+      <StackPanel Orientation="Vertical" Spacing="8">
+        <Label Classes="h2" Target="{Binding #firstResFont}">_res fonts</Label>
+        <TextBox Width="200" x:Name="firstResFont" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-Italic.ttf#Source Sans Pro"/>
+        <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-*.ttf#Source Sans Pro"/>
       </StackPanel>
+    </StackPanel>
   </StackPanel>
 </UserControl>
diff --git a/src/Avalonia.Animation/Properties/AssemblyInfo.cs b/src/Avalonia.Animation/Properties/AssemblyInfo.cs
index de0b4a9971..221b51e95a 100644
--- a/src/Avalonia.Animation/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Animation/Properties/AssemblyInfo.cs
@@ -6,5 +6,10 @@ using System.Runtime.CompilerServices;
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation.Easings")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation.Animators")]
 
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.LeakTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Animation.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.LeakTests")]
+[assembly: InternalsVisibleTo("Avalonia.Animation.UnitTests")]
+#endif
diff --git a/src/Avalonia.Base/Properties/AssemblyInfo.cs b/src/Avalonia.Base/Properties/AssemblyInfo.cs
index 73be561ae2..e06cb75a4d 100644
--- a/src/Avalonia.Base/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Base/Properties/AssemblyInfo.cs
@@ -5,8 +5,16 @@ using System.Runtime.CompilerServices;
 using Avalonia.Metadata;
 
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Data.Converters")]
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Base.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")] 
 [assembly: InternalsVisibleTo("Avalonia.Controls.DataGrid, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Markup.Xaml.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.Base.UnitTests")]
+[assembly: InternalsVisibleTo("Avalonia.UnitTests")]
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
+[assembly: InternalsVisibleTo("Avalonia.Controls.DataGrid")]
+[assembly: InternalsVisibleTo("Avalonia.Markup.Xaml.UnitTests")]
+#endif
diff --git a/src/Avalonia.Controls.DataGrid/Properties/AssemblyInfo.cs b/src/Avalonia.Controls.DataGrid/Properties/AssemblyInfo.cs
index 72dd949421..1b122996d2 100644
--- a/src/Avalonia.Controls.DataGrid/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Controls.DataGrid/Properties/AssemblyInfo.cs
@@ -1,10 +1,13 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using Avalonia.Metadata;
-
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Controls.DataGrid.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.DesignerSupport, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
-
+#else
+[assembly: InternalsVisibleTo("Avalonia.Controls.DataGrid.UnitTests")]
+[assembly: InternalsVisibleTo("Avalonia.DesignerSupport")]
+#endif
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls.Collections")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls.Primitives")]
diff --git a/src/Avalonia.Controls/Label.cs b/src/Avalonia.Controls/Label.cs
new file mode 100644
index 0000000000..76708b8f00
--- /dev/null
+++ b/src/Avalonia.Controls/Label.cs
@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Text;
+using Avalonia.Controls.Primitives;
+using Avalonia.Controls.Templates;
+using Avalonia.Data;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Label control. Focuses <see cref="Target"/> on pointer click or access key press (Alt + accessKey)
+    /// </summary>
+    public class Label : ContentControl
+    {
+        /// <summary>
+        /// Defines the <see cref="Target"/> Direct property
+        /// </summary>
+        public static readonly DirectProperty<Label, IInputElement> TargetProperty =
+            AvaloniaProperty.RegisterDirect<Label, IInputElement>(nameof(Target), lbl => lbl.Target, (lbl, inp) => lbl.Target = inp);
+
+        /// <summary>
+        /// Label focus target storage field
+        /// </summary>
+        private IInputElement _target;
+
+        /// <summary>
+        /// Label focus Target
+        /// </summary>
+        public IInputElement Target
+        {
+            get => _target;
+            set => SetAndRaise(TargetProperty, ref _target, value);
+        }
+
+        static Label()
+        {
+            AccessKeyHandler.AccessKeyPressedEvent.AddClassHandler<Label>((lbl, args) => lbl.LabelActivated(args));
+            // IsTabStopProperty.OverrideDefaultValue<Label>(false)
+            FocusableProperty.OverrideDefaultValue<Label>(false);
+        }
+
+        /// <summary>
+        /// Initializes instance of <see cref="Label"/> control
+        /// </summary>
+        public Label()
+        {
+        }
+
+        /// <summary>
+        /// Method which focuses <see cref="Target"/> input element
+        /// </summary>
+        private void LabelActivated(RoutedEventArgs args)
+        {
+            Target?.Focus();
+            args.Handled = Target != null;
+        }
+
+        /// <summary>
+        /// Handler of <see cref="IInputElement.PointerPressed"/> event
+        /// </summary>
+        /// <param name="e">Event Arguments</param>
+        protected override void OnPointerPressed(PointerPressedEventArgs e)
+        {
+            if (e.GetCurrentPoint(this).Properties.PointerUpdateKind == PointerUpdateKind.LeftButtonPressed)
+            {
+                LabelActivated(e);
+            }
+            base.OnPointerPressed(e);
+        }
+    }
+}
diff --git a/src/Avalonia.Controls/Presenters/ContentPresenter.cs b/src/Avalonia.Controls/Presenters/ContentPresenter.cs
index 3fd927afa3..b28927c969 100644
--- a/src/Avalonia.Controls/Presenters/ContentPresenter.cs
+++ b/src/Avalonia.Controls/Presenters/ContentPresenter.cs
@@ -85,10 +85,19 @@ namespace Avalonia.Controls.Presenters
         public static readonly StyledProperty<Thickness> PaddingProperty =
             Decorator.PaddingProperty.AddOwner<ContentPresenter>();
 
+        /// <summary>
+        /// Defines the <see cref="RecognizesAccessKey"/> property
+        /// </summary>
+        public static readonly DirectProperty<ContentPresenter, bool> RecognizesAccessKeyProperty =
+            AvaloniaProperty.RegisterDirect<ContentPresenter, bool>(
+                nameof(RecognizesAccessKey),
+                cp => cp.RecognizesAccessKey, (cp, value) => cp.RecognizesAccessKey = value);
+
         private IControl _child;
         private bool _createdChild;
         private IRecyclingDataTemplate _recyclingDataTemplate;
         private readonly BorderRenderHelper _borderRenderer = new BorderRenderHelper();
+        private bool _recognizesAccessKey;
 
         /// <summary>
         /// Initializes static members of the <see cref="ContentPresenter"/> class.
@@ -208,6 +217,15 @@ namespace Avalonia.Controls.Presenters
             set { SetValue(PaddingProperty, value); }
         }
 
+        /// <summary>
+        /// Determine if <see cref="ContentPresenter"/> should use <see cref="AccessText"/> in its style
+        /// </summary>
+        public bool RecognizesAccessKey
+        {
+            get => _recognizesAccessKey;
+            set => SetAndRaise(RecognizesAccessKeyProperty, ref _recognizesAccessKey, value);
+        }
+
         /// <summary>
         /// Gets the host content control.
         /// </summary>
@@ -311,7 +329,12 @@ namespace Avalonia.Controls.Presenters
 
             if (content != null && newChild == null)
             {
-                var dataTemplate = this.FindDataTemplate(content, ContentTemplate) ?? FuncDataTemplate.Default;
+                var dataTemplate = this.FindDataTemplate(content, ContentTemplate) ?? 
+                    (
+                        RecognizesAccessKey 
+                            ? FuncDataTemplate.Access 
+                            : FuncDataTemplate.Default
+                    );
 
                 if (dataTemplate is IRecyclingDataTemplate rdt)
                 {
diff --git a/src/Avalonia.Controls/Properties/AssemblyInfo.cs b/src/Avalonia.Controls/Properties/AssemblyInfo.cs
index 5e18115ac8..5c9017f127 100644
--- a/src/Avalonia.Controls/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Controls/Properties/AssemblyInfo.cs
@@ -1,10 +1,13 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using Avalonia.Metadata;
-
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Controls.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.DesignerSupport, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
-
+#else
+[assembly: InternalsVisibleTo("Avalonia.Controls.UnitTests")]
+[assembly: InternalsVisibleTo("Avalonia.DesignerSupport")]
+#endif
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls.Embedding")]
diff --git a/src/Avalonia.Controls/Selection/SelectionModel.cs b/src/Avalonia.Controls/Selection/SelectionModel.cs
index 3b5d57a7b8..054974e4f1 100644
--- a/src/Avalonia.Controls/Selection/SelectionModel.cs
+++ b/src/Avalonia.Controls/Selection/SelectionModel.cs
@@ -442,7 +442,8 @@ namespace Avalonia.Controls.Selection
                 RaisePropertyChanged(nameof(SelectedIndex));
             }
 
-            if (e.Action == NotifyCollectionChangedAction.Remove && e.OldStartingIndex <= oldSelectedIndex)
+            if ((e.Action == NotifyCollectionChangedAction.Remove && e.OldStartingIndex <= oldSelectedIndex) ||
+                e.Action == NotifyCollectionChangedAction.Reset)
             {
                 RaisePropertyChanged(nameof(SelectedItem));
             }
diff --git a/src/Avalonia.Controls/Templates/FuncDataTemplate.cs b/src/Avalonia.Controls/Templates/FuncDataTemplate.cs
index 1afd86a11e..5dff13997e 100644
--- a/src/Avalonia.Controls/Templates/FuncDataTemplate.cs
+++ b/src/Avalonia.Controls/Templates/FuncDataTemplate.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Reactive.Linq;
+using Avalonia.Controls.Primitives;
 
 namespace Avalonia.Controls.Templates
 {
@@ -30,6 +31,31 @@ namespace Avalonia.Controls.Templates
                 },
                 true);
 
+        /// <summary>
+        /// The default data template used in the case where no matching data template is found
+        /// but <see cref="AccessText"/> should be used.
+        /// </summary>
+        public static readonly FuncDataTemplate Access =
+            new FuncDataTemplate<object>(
+                (data, s) =>
+                {
+                    if (data != null)
+                    {
+                        var result = new AccessText();
+                        result.Bind(TextBlock.TextProperty,
+                            result.GetObservable(Control.DataContextProperty).Select(x => x?.ToString()));
+                        return result;
+                    }
+                    else
+                    {
+                        return null;
+                    }
+                },
+                true);
+
+        /// <summary>
+        /// The implementation of the <see cref="Match"/> method.
+        /// </summary>
         private readonly Func<object, bool> _match;
         private readonly bool _supportsRecycling;
 
@@ -42,7 +68,7 @@ namespace Avalonia.Controls.Templates
         /// </param>
         /// <param name="supportsRecycling">Whether the control can be recycled.</param>
         public FuncDataTemplate(
-            Type type, 
+            Type type,
             Func<object, INameScope, IControl> build,
             bool supportsRecycling = false)
             : this(o => IsInstance(o, type), build, supportsRecycling)
diff --git a/src/Avalonia.Layout/Properties/AssemblyInfo.cs b/src/Avalonia.Layout/Properties/AssemblyInfo.cs
index efcbf184b5..63afaa8e3e 100644
--- a/src/Avalonia.Layout/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Layout/Properties/AssemblyInfo.cs
@@ -1,7 +1,9 @@
 using System.Runtime.CompilerServices;
 using Avalonia.Metadata;
-
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Layout.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
-
+#else
+[assembly: InternalsVisibleTo("Avalonia.Layout.UnitTests")]
+#endif
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Layout")]
 
diff --git a/src/Avalonia.ReactiveUI.Events/Avalonia.ReactiveUI.Events.csproj b/src/Avalonia.ReactiveUI.Events/Avalonia.ReactiveUI.Events.csproj
index 75eeb92f42..7f58e455f9 100644
--- a/src/Avalonia.ReactiveUI.Events/Avalonia.ReactiveUI.Events.csproj
+++ b/src/Avalonia.ReactiveUI.Events/Avalonia.ReactiveUI.Events.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <PackageId>Avalonia.ReactiveUI.Events</PackageId>
+    <SignAssembly>false</SignAssembly>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\packages\Avalonia\Avalonia.csproj" />
diff --git a/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj b/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj
index 3d7bd2548a..624c5772a9 100644
--- a/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj
+++ b/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj
@@ -2,7 +2,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <PackageId>Avalonia.ReactiveUI</PackageId>
-    <SignAssembly>True</SignAssembly>
+    <SignAssembly>false</SignAssembly>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\packages\Avalonia\Avalonia.csproj" />
diff --git a/src/Avalonia.Styling/Properties/AssemblyInfo.cs b/src/Avalonia.Styling/Properties/AssemblyInfo.cs
index f6b69d8150..34c71fffe3 100644
--- a/src/Avalonia.Styling/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Styling/Properties/AssemblyInfo.cs
@@ -5,4 +5,8 @@ using Avalonia.Metadata;
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Controls")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.LogicalTree")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Styling")]
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Styling.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.Styling.UnitTests")]
+#endif
diff --git a/src/Avalonia.Themes.Default/DefaultTheme.xaml b/src/Avalonia.Themes.Default/DefaultTheme.xaml
index 625b409598..107fc07875 100644
--- a/src/Avalonia.Themes.Default/DefaultTheme.xaml
+++ b/src/Avalonia.Themes.Default/DefaultTheme.xaml
@@ -12,7 +12,8 @@
   <StyleInclude Source="resm:Avalonia.Themes.Default.CaptionButtons.xaml?assembly=Avalonia.Themes.Default"/>
   <StyleInclude Source="resm:Avalonia.Themes.Default.ComboBox.xaml?assembly=Avalonia.Themes.Default"/>
   <StyleInclude Source="resm:Avalonia.Themes.Default.ComboBoxItem.xaml?assembly=Avalonia.Themes.Default"/>
-  <StyleInclude Source="resm:Avalonia.Themes.Default.ContentControl.xaml?assembly=Avalonia.Themes.Default"/>  
+  <StyleInclude Source="resm:Avalonia.Themes.Default.ContentControl.xaml?assembly=Avalonia.Themes.Default"/>
+  <StyleInclude Source="resm:Avalonia.Themes.Default.Label.xaml?assembly=Avalonia.Themes.Default"/>
   <StyleInclude Source="resm:Avalonia.Themes.Default.GridSplitter.xaml?assembly=Avalonia.Themes.Default"/>
   <StyleInclude Source="resm:Avalonia.Themes.Default.ItemsControl.xaml?assembly=Avalonia.Themes.Default"/>
   <StyleInclude Source="resm:Avalonia.Themes.Default.ListBox.xaml?assembly=Avalonia.Themes.Default"/>
diff --git a/src/Avalonia.Themes.Default/Label.xaml b/src/Avalonia.Themes.Default/Label.xaml
new file mode 100644
index 0000000000..d93381aa69
--- /dev/null
+++ b/src/Avalonia.Themes.Default/Label.xaml
@@ -0,0 +1,17 @@
+<Style xmlns="https://github.com/avaloniaui" Selector="Label">
+  <Setter Property="Padding" Value="3"/>
+  <Setter Property="Template">
+    <ControlTemplate>
+      <ContentPresenter Name="PART_ContentPresenter"
+                        Background="{TemplateBinding Background}"
+                        BorderBrush="{TemplateBinding BorderBrush}"
+                        BorderThickness="{TemplateBinding BorderThickness}"
+                        ContentTemplate="{TemplateBinding ContentTemplate}"
+                        Content="{TemplateBinding Content}"
+                        Padding="{TemplateBinding Padding}"
+                        RecognizesAccessKey="True"
+                        VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
+                        HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
+    </ControlTemplate>
+  </Setter>
+</Style>
diff --git a/src/Avalonia.Themes.Fluent/FluentTheme.xaml b/src/Avalonia.Themes.Fluent/FluentTheme.xaml
index 90c0f55b68..4e0e4fe862 100644
--- a/src/Avalonia.Themes.Fluent/FluentTheme.xaml
+++ b/src/Avalonia.Themes.Fluent/FluentTheme.xaml
@@ -11,7 +11,8 @@
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/CheckBox.xaml"/>
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/ComboBox.xaml"/>
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/ComboBoxItem.xaml"/>
-  <StyleInclude Source="avares://Avalonia.Themes.Fluent/ContentControl.xaml"/>  
+  <StyleInclude Source="avares://Avalonia.Themes.Fluent/ContentControl.xaml"/>
+  <StyleInclude Source="avares://Avalonia.Themes.Fluent/Label.xaml"/>
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/GridSplitter.xaml"/>
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/ItemsControl.xaml"/>
   <StyleInclude Source="avares://Avalonia.Themes.Fluent/ListBox.xaml"/>
diff --git a/src/Avalonia.Themes.Fluent/Label.xaml b/src/Avalonia.Themes.Fluent/Label.xaml
new file mode 100644
index 0000000000..d93381aa69
--- /dev/null
+++ b/src/Avalonia.Themes.Fluent/Label.xaml
@@ -0,0 +1,17 @@
+<Style xmlns="https://github.com/avaloniaui" Selector="Label">
+  <Setter Property="Padding" Value="3"/>
+  <Setter Property="Template">
+    <ControlTemplate>
+      <ContentPresenter Name="PART_ContentPresenter"
+                        Background="{TemplateBinding Background}"
+                        BorderBrush="{TemplateBinding BorderBrush}"
+                        BorderThickness="{TemplateBinding BorderThickness}"
+                        ContentTemplate="{TemplateBinding ContentTemplate}"
+                        Content="{TemplateBinding Content}"
+                        Padding="{TemplateBinding Padding}"
+                        RecognizesAccessKey="True"
+                        VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
+                        HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
+    </ControlTemplate>
+  </Setter>
+</Style>
diff --git a/src/Avalonia.Visuals/Properties/AssemblyInfo.cs b/src/Avalonia.Visuals/Properties/AssemblyInfo.cs
index 5bb9ae78b0..48107a31f8 100644
--- a/src/Avalonia.Visuals/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Visuals/Properties/AssemblyInfo.cs
@@ -2,13 +2,20 @@ using System.Reflection;
 using System.Runtime.CompilerServices;
 using Avalonia.Metadata;
 
-[assembly: InternalsVisibleTo("Avalonia.Visuals.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Media")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Media.Imaging")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Media.Transformation")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia")]
 
+#if SIGNED_BUILD
+[assembly: InternalsVisibleTo("Avalonia.Visuals.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Direct2D1.RenderTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Skia.RenderTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Skia.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.Visuals.UnitTests")]
+[assembly: InternalsVisibleTo("Avalonia.Direct2D1.RenderTests")]
+[assembly: InternalsVisibleTo("Avalonia.Skia.RenderTests")]
+[assembly: InternalsVisibleTo("Avalonia.Skia.UnitTests")]
+#endif
diff --git a/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj b/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
index 44a082e2df..3e15d2f700 100644
--- a/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
+++ b/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <DefineConstants>PCL;NETSTANDARD;NETSTANDARD2_0;HAS_TYPE_CONVERTER;HAS_CUSTOM_ATTRIBUTE_PROVIDER;XAMLX_INTERNAL</DefineConstants>
+    <DefineConstants>$(DefineConstants);PCL;NETSTANDARD;NETSTANDARD2_0;HAS_TYPE_CONVERTER;HAS_CUSTOM_ATTRIBUTE_PROVIDER;XAMLX_INTERNAL</DefineConstants>
     <UseCecil>false</UseCecil>
     <DefineConstants Condition="$(UseCecil) == true">$(DefineConstants);RUNTIME_XAML_CECIL</DefineConstants>
     <EnableDefaultCompileItems>False</EnableDefaultCompileItems>
diff --git a/src/Markup/Avalonia.Markup.Xaml/Properties/AssemblyInfo.cs b/src/Markup/Avalonia.Markup.Xaml/Properties/AssemblyInfo.cs
index cee2b8a484..706729a5ac 100644
--- a/src/Markup/Avalonia.Markup.Xaml/Properties/AssemblyInfo.cs
+++ b/src/Markup/Avalonia.Markup.Xaml/Properties/AssemblyInfo.cs
@@ -5,5 +5,8 @@ using System.Runtime.CompilerServices;
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Markup.Xaml.MarkupExtensions")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Markup.Xaml.Styling")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Markup.Xaml.Templates")]
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Markup.Xaml.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
-
+#else
+[assembly: InternalsVisibleTo("Avalonia.Markup.Xaml.UnitTests")]
+#endif
diff --git a/src/Markup/Avalonia.Markup/Properties/AssemblyInfo.cs b/src/Markup/Avalonia.Markup/Properties/AssemblyInfo.cs
index 3da708bc9c..ac055af98b 100644
--- a/src/Markup/Avalonia.Markup/Properties/AssemblyInfo.cs
+++ b/src/Markup/Avalonia.Markup/Properties/AssemblyInfo.cs
@@ -4,4 +4,8 @@ using System.Runtime.CompilerServices;
 
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Data")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Markup.Data")]
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Markup.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.Markup.UnitTests")]
+#endif
diff --git a/src/Skia/Avalonia.Skia/Properties/AssemblyInfo.cs b/src/Skia/Avalonia.Skia/Properties/AssemblyInfo.cs
index b923e3a9f6..309129ccd9 100644
--- a/src/Skia/Avalonia.Skia/Properties/AssemblyInfo.cs
+++ b/src/Skia/Avalonia.Skia/Properties/AssemblyInfo.cs
@@ -1,4 +1,8 @@
 using System.Runtime.CompilerServices;
-
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Skia.RenderTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Skia.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
+#else
+[assembly: InternalsVisibleTo("Avalonia.Skia.RenderTests")]
+[assembly: InternalsVisibleTo("Avalonia.Skia.UnitTests")]
+#endif
diff --git a/src/Windows/Avalonia.Direct2D1/Properties/AssemblyInfo.cs b/src/Windows/Avalonia.Direct2D1/Properties/AssemblyInfo.cs
index 78e7b4aad6..6cc8b793c0 100644
--- a/src/Windows/Avalonia.Direct2D1/Properties/AssemblyInfo.cs
+++ b/src/Windows/Avalonia.Direct2D1/Properties/AssemblyInfo.cs
@@ -6,6 +6,10 @@ using Avalonia.Direct2D1;
 [assembly: ExportRenderingSubsystem(OperatingSystemType.WinNT, 1, "Direct2D1", typeof(Direct2D1Platform), nameof(Direct2D1Platform.Initialize),
     typeof(Direct2DChecker))]
 
+#if SIGNED_BUILD
 [assembly: InternalsVisibleTo("Avalonia.Direct2D1.RenderTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
 [assembly: InternalsVisibleTo("Avalonia.Direct2D1.UnitTests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c1bba1142285fe0419326fb25866ba62c47e6c2b5c1ab0c95b46413fad375471232cb81706932e1cef38781b9ebd39d5100401bacb651c6c5bbf59e571e81b3bc08d2a622004e08b1a6ece82a7e0b9857525c86d2b95fab4bc3dce148558d7f3ae61aa3a234086902aeface87d9dfdd32b9d2fe3c6dd4055b5ab4b104998bd87")]
-
+#else
+[assembly: InternalsVisibleTo("Avalonia.Direct2D1.RenderTests")]
+[assembly: InternalsVisibleTo("Avalonia.Direct2D1.UnitTests")]
+#endif
diff --git a/src/Windows/Avalonia.Win32/FramebufferManager.cs b/src/Windows/Avalonia.Win32/FramebufferManager.cs
index 6969a49dad..699dc7c25d 100644
--- a/src/Windows/Avalonia.Win32/FramebufferManager.cs
+++ b/src/Windows/Avalonia.Win32/FramebufferManager.cs
@@ -1,41 +1,191 @@
 using System;
+using System.Threading;
 using Avalonia.Controls.Platform.Surfaces;
 using Avalonia.Platform;
 using Avalonia.Win32.Interop;
 
+#nullable enable
+
 namespace Avalonia.Win32
 {
-    class FramebufferManager : IFramebufferPlatformSurface, IDisposable
+    internal class FramebufferManager : IFramebufferPlatformSurface, IDisposable
     {
+        private const int _bytesPerPixel = 4;
+        private const PixelFormat _format = PixelFormat.Bgra8888;
+
         private readonly IntPtr _hwnd;
-        private WindowFramebuffer _fb;
+        private readonly object _lock;
+        private readonly Action _onDisposeAction;
+
+        private FramebufferData? _framebufferData;
 
         public FramebufferManager(IntPtr hwnd)
         {
             _hwnd = hwnd;
+            _lock = new object();
+            _onDisposeAction = DrawAndUnlock;
         }
 
         public ILockedFramebuffer Lock()
         {
-            UnmanagedMethods.GetClientRect(_hwnd, out var rc);
+            Monitor.Enter(_lock);
 
-            var width = Math.Max(1, rc.right - rc.left);
-            var height = Math.Max(1, rc.bottom - rc.top);
+            LockedFramebuffer? fb = null;
 
-            if ((_fb == null || _fb.Size.Width != width || _fb.Size.Height != height))
+            try
             {
-                _fb?.Deallocate();
-                _fb = null;
-                _fb = new WindowFramebuffer(_hwnd, new PixelSize(width, height));
-            }
+                UnmanagedMethods.GetClientRect(_hwnd, out var rc);
+
+                var width = Math.Max(1, rc.right - rc.left);
+                var height = Math.Max(1, rc.bottom - rc.top);
+
+                if (_framebufferData is null || _framebufferData?.Size.Width != width || _framebufferData?.Size.Height != height)
+                {
+                    _framebufferData?.Dispose();
+
+                    _framebufferData = AllocateFramebufferData(width, height);
+                }
+
+                var framebufferData = _framebufferData.Value;
 
-            return _fb;
+                return fb = new LockedFramebuffer(
+                    framebufferData.Data.Address, framebufferData.Size, framebufferData.RowBytes,
+                    GetCurrentDpi(), _format, _onDisposeAction);
+            }
+            finally
+            {
+                // We free the lock when for whatever reason framebuffer was not created.
+                // This allows for a potential retry later.
+                if (fb is null)
+                {
+                    Monitor.Exit(_lock);
+                }
+            }
         }
 
         public void Dispose()
         {
-            _fb?.Deallocate();
-            _fb = null;
+            lock (_lock)
+            {
+                _framebufferData?.Dispose();
+                _framebufferData = null;
+            }
+        }
+
+        private void DrawAndUnlock()
+        {
+            try
+            {
+                if (_framebufferData.HasValue)
+                    DrawToWindow(_hwnd, _framebufferData.Value);
+            }
+            finally
+            {
+                Monitor.Exit(_lock);
+            }
+        }
+
+        private Vector GetCurrentDpi()
+        {
+            if (UnmanagedMethods.ShCoreAvailable)
+            {
+                var monitor =
+                    UnmanagedMethods.MonitorFromWindow(_hwnd, UnmanagedMethods.MONITOR.MONITOR_DEFAULTTONEAREST);
+
+                if (UnmanagedMethods.GetDpiForMonitor(
+                    monitor,
+                    UnmanagedMethods.MONITOR_DPI_TYPE.MDT_EFFECTIVE_DPI,
+                    out var dpix,
+                    out var dpiy) == 0)
+                {
+                    return new Vector(dpix, dpiy);
+                }
+            }
+
+            return new Vector(96, 96);
+        }
+
+        private static FramebufferData AllocateFramebufferData(int width, int height)
+        {
+            var bitmapBlob = AvaloniaLocator.Current.GetService<IRuntimePlatform>().AllocBlob(width * height * _bytesPerPixel);
+
+            return new FramebufferData(bitmapBlob, width, height);
+        }
+
+        private static void DrawToDevice(FramebufferData framebufferData, IntPtr hDC, int destX = 0, int destY = 0, int srcX = 0,
+            int srcY = 0, int width = -1,
+            int height = -1)
+        {
+            if (width == -1)
+                width = framebufferData.Size.Width;
+            if (height == -1)
+                height = framebufferData.Size.Height;
+
+            var bmpInfo = framebufferData.Header;
+
+            UnmanagedMethods.SetDIBitsToDevice(hDC, destX, destY, (uint)width, (uint)height, srcX, srcY,
+                0, (uint)framebufferData.Size.Height, framebufferData.Data.Address, ref bmpInfo, 0);
+        }
+
+        private static bool DrawToWindow(IntPtr hWnd, FramebufferData framebufferData, int destX = 0, int destY = 0, int srcX = 0,
+            int srcY = 0, int width = -1,
+            int height = -1)
+        {
+            if (framebufferData.Data.IsDisposed)
+                throw new ObjectDisposedException("Framebuffer");
+
+            if (hWnd == IntPtr.Zero)
+                return false;
+
+            var hDC = UnmanagedMethods.GetDC(hWnd);
+
+            if (hDC == IntPtr.Zero)
+                return false;
+
+            try
+            {
+                DrawToDevice(framebufferData, hDC, destX, destY, srcX, srcY, width, height);
+            }
+            finally
+            {
+                UnmanagedMethods.ReleaseDC(hWnd, hDC);
+            }
+
+            return true;
+        }
+
+        private readonly struct FramebufferData
+        {
+            public IUnmanagedBlob Data { get; }
+
+            public PixelSize Size { get; }
+
+            public int RowBytes => Size.Width * _bytesPerPixel;
+
+            public UnmanagedMethods.BITMAPINFOHEADER Header { get; }
+
+            public FramebufferData(IUnmanagedBlob data, int width, int height)
+            {
+                Data = data;
+                Size = new PixelSize(width, height);
+
+                var header = new UnmanagedMethods.BITMAPINFOHEADER();
+                header.Init();
+
+                header.biPlanes = 1;
+                header.biBitCount = _bytesPerPixel * 8;
+                header.Init();
+
+                header.biWidth = width;
+                header.biHeight = -height;
+
+                Header = header;
+            }
+
+            public void Dispose()
+            {
+                Data.Dispose();
+            }
         }
     }
 }
diff --git a/src/Windows/Avalonia.Win32/WindowFramebuffer.cs b/src/Windows/Avalonia.Win32/WindowFramebuffer.cs
deleted file mode 100644
index 19b90685bf..0000000000
--- a/src/Windows/Avalonia.Win32/WindowFramebuffer.cs
+++ /dev/null
@@ -1,100 +0,0 @@
-using System;
-using Avalonia.Platform;
-using Avalonia.Win32.Interop;
-using PixelFormat = Avalonia.Platform.PixelFormat;
-
-namespace Avalonia.Win32
-{
-    public class WindowFramebuffer : ILockedFramebuffer
-    {
-        private readonly IntPtr _handle;
-        private IUnmanagedBlob _bitmapBlob;
-        private UnmanagedMethods.BITMAPINFOHEADER _bmpInfo;
-
-        public WindowFramebuffer(IntPtr handle, PixelSize size)
-        {
-            
-            if (size.Width <= 0)
-                throw new ArgumentException("Width is less than zero");
-            if (size.Height <= 0)
-                throw new ArgumentException("Height is less than zero");
-            _handle = handle;
-            _bmpInfo.Init();
-            _bmpInfo.biPlanes = 1;
-            _bmpInfo.biBitCount = 32;
-            _bmpInfo.Init();
-            _bmpInfo.biWidth = size.Width;
-            _bmpInfo.biHeight = -size.Height;
-            _bitmapBlob = AvaloniaLocator.Current.GetService<IRuntimePlatform>().AllocBlob(size.Width * size.Height * 4);
-        }
-
-        ~WindowFramebuffer()
-        {
-            Deallocate();
-        }
-
-        public IntPtr Address => _bitmapBlob.Address;
-        public int RowBytes => Size.Width * 4;
-        public PixelFormat Format => PixelFormat.Bgra8888;
-
-        public Vector Dpi
-        {
-            get
-            {
-                if (UnmanagedMethods.ShCoreAvailable)
-                {
-                    uint dpix, dpiy;
-
-                    var monitor = UnmanagedMethods.MonitorFromWindow(_handle,
-                        UnmanagedMethods.MONITOR.MONITOR_DEFAULTTONEAREST);
-
-                    if (UnmanagedMethods.GetDpiForMonitor(
-                            monitor,
-                            UnmanagedMethods.MONITOR_DPI_TYPE.MDT_EFFECTIVE_DPI,
-                            out dpix,
-                            out dpiy) == 0)
-                    {
-                        return new Vector(dpix, dpiy);
-                    }
-                }
-                return new Vector(96, 96);
-            }
-        }
-
-        public PixelSize Size => new PixelSize(_bmpInfo.biWidth, -_bmpInfo.biHeight);
-
-        public void DrawToDevice(IntPtr hDC, int destX = 0, int destY = 0, int srcX = 0, int srcY = 0, int width = -1,
-            int height = -1)
-        {
-            if (width == -1)
-                width = Size.Width;
-            if (height == -1)
-                height = Size.Height;
-            UnmanagedMethods.SetDIBitsToDevice(hDC, destX, destY, (uint) width, (uint) height, srcX, srcY,
-                0, (uint)Size.Height, _bitmapBlob.Address, ref _bmpInfo, 0);
-        }
-
-        public bool DrawToWindow(IntPtr hWnd, int destX = 0, int destY = 0, int srcX = 0, int srcY = 0, int width = -1,
-            int height = -1)
-        {
-            if (_bitmapBlob.IsDisposed)
-                throw new ObjectDisposedException("Framebuffer");
-            if (hWnd == IntPtr.Zero)
-                return false;
-            IntPtr hDC = UnmanagedMethods.GetDC(hWnd);
-            if (hDC == IntPtr.Zero)
-                return false;
-            DrawToDevice(hDC, destX, destY, srcX, srcY, width, height);
-            UnmanagedMethods.ReleaseDC(hWnd, hDC);
-            return true;
-        }
-
-        public void Dispose()
-        {
-            //It's not an *actual* dispose. This call means "We are done drawing"
-            DrawToWindow(_handle);
-        }
-
-        public void Deallocate() => _bitmapBlob.Dispose();
-    }
-}
diff --git a/tests/Avalonia.Controls.UnitTests/Selection/InternalSelectionModelTests.cs b/tests/Avalonia.Controls.UnitTests/Selection/InternalSelectionModelTests.cs
index b64812e290..ce3e698cf3 100644
--- a/tests/Avalonia.Controls.UnitTests/Selection/InternalSelectionModelTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/Selection/InternalSelectionModelTests.cs
@@ -205,6 +205,49 @@ namespace Avalonia.Controls.UnitTests.Selection
             Assert.Equal(2, target.SelectedIndex);
         }
 
+        [Fact]
+        public void Raises_Selection_Changed_On_Items_Reset()
+        {
+            var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
+            var target = CreateTarget(source: items);
+
+            target.SelectedIndex = 1;
+
+            var changed = new List<string>();
+
+            target.PropertyChanged += (s, e) => changed.Add(e.PropertyName);
+
+            var oldSelectedIndex = target.SelectedIndex;
+            var oldSelectedItem = target.SelectedItem;
+
+            items.Reset(new string[0]);
+
+            Assert.NotEqual(oldSelectedIndex, target.SelectedIndex);
+            Assert.NotEqual(oldSelectedItem, target.SelectedItem);
+
+            Assert.Equal(-1, target.SelectedIndex);
+            Assert.Equal(null, target.SelectedItem);
+
+            Assert.Contains(nameof(target.SelectedIndex), changed);
+            Assert.Contains(nameof(target.SelectedItem), changed);
+        }
+
+        [Fact]
+        public void Preserves_SelectedItem_On_Items_Reset()
+        {
+            var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
+            var target = CreateTarget(source: items);
+
+            target.SelectedItem = "foo";
+
+            Assert.Equal(0, target.SelectedIndex);
+
+            items.Reset(new string[] { "baz", "foo", "bar" });
+
+            Assert.Equal("foo", target.SelectedItem);
+            Assert.Equal(1, target.SelectedIndex);
+        }
+
         [Fact]
         public void Preserves_Selection_On_Source_Changed()
         {
@@ -222,7 +265,7 @@ namespace Avalonia.Controls.UnitTests.Selection
             bool nullSource = false)
         {
             source ??= !nullSource ? new[] { "foo", "bar", "baz" } : null;
-            
+
             var result = new InternalSelectionModel
             {
                 SingleSelect = singleSelect,
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/Avalonia.ReactiveUI.UnitTests.csproj b/tests/Avalonia.ReactiveUI.UnitTests/Avalonia.ReactiveUI.UnitTests.csproj
index d162a2abe0..95e10d7a2f 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/Avalonia.ReactiveUI.UnitTests.csproj
+++ b/tests/Avalonia.ReactiveUI.UnitTests/Avalonia.ReactiveUI.UnitTests.csproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
+    <SignAssembly>false</SignAssembly>
   </PropertyGroup>
   <Import Project="..\..\build\UnitTests.NetCore.targets" />
   <Import Project="..\..\build\Moq.props" />
diff --git a/tests/Avalonia.UnitTests/Avalonia.UnitTests.csproj b/tests/Avalonia.UnitTests/Avalonia.UnitTests.csproj
index 11394c6e5c..6b5c7a66ff 100644
--- a/tests/Avalonia.UnitTests/Avalonia.UnitTests.csproj
+++ b/tests/Avalonia.UnitTests/Avalonia.UnitTests.csproj
@@ -7,7 +7,7 @@
     <IsPackable>false</IsPackable>
     <LangVersion>latest</LangVersion>
     <AssemblyOriginatorKeyFile>..\..\build\avalonia.snk</AssemblyOriginatorKeyFile>
-    <SignAssembly>True</SignAssembly>
+    <SignAssembly>false</SignAssembly>
   </PropertyGroup>
   <ItemGroup>
     <EmbeddedResource Include="..\Avalonia.UnitTests\Assets\*.ttf" />