diff --git a/.editorconfig b/.editorconfig
index 337760636b..9014c8938f 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -141,6 +141,8 @@ dotnet_analyzer_diagnostic.category-Performance.severity = none #error - Uncomme
 dotnet_diagnostic.CA1802.severity = warning
 # CA1825: Avoid zero-length array allocations
 dotnet_diagnostic.CA1825.severity = warning
+# CA1821: Remove empty finalizers
+dotnet_diagnostic.CA1821.severity = warning
 
 # Wrapping preferences
 csharp_wrap_before_ternary_opsigns = false
diff --git a/samples/ControlCatalog/Pages/DateTimePickerPage.xaml b/samples/ControlCatalog/Pages/DateTimePickerPage.xaml
index 29cd939520..6217d39b21 100644
--- a/samples/ControlCatalog/Pages/DateTimePickerPage.xaml
+++ b/samples/ControlCatalog/Pages/DateTimePickerPage.xaml
@@ -13,17 +13,17 @@
                 Margin="16"
                 HorizontalAlignment="Stretch"
                 Spacing="16">
-      <TextBlock FontSize="18">A simple DatePicker with a header</TextBlock>
+      <TextBlock FontSize="18">A simple DatePicker</TextBlock>
       <StackPanel Orientation="Vertical">
         <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
                 BorderThickness="1" Padding="15">
-          <DatePicker Header="Pick a date" />
+          <DatePicker />
         </Border>
         <Panel Background="{DynamicResource SystemControlBackgroundBaseLowBrush}">
           <TextBlock Padding="15">
             <TextBlock.Text>
               <x:String>
-                &lt;DatePicker Header="Pick a date" /&gt;
+                &lt;DatePicker/&gt;
               </x:String>
             </TextBlock.Text>
           </TextBlock>
@@ -33,7 +33,7 @@
       
       <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
               BorderThickness="1" Padding="15">
-        <DatePicker Header="Pick a date">
+        <DatePicker >
           <DataValidationErrors.Error>
             <sys:Exception /> 
           </DataValidationErrors.Error>
@@ -79,24 +79,24 @@
       
       <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
               BorderThickness="1" Padding="15">
-        <TimePicker Header="Pick a time">
+        <TimePicker>
           <DataValidationErrors.Error>
             <sys:Exception /> 
           </DataValidationErrors.Error>
         </TimePicker>
       </Border>
 
-      <TextBlock FontSize="18">A TimePicker with a header and minute increments specified.</TextBlock>
+      <TextBlock FontSize="18">A TimePicker with minute increments specified.</TextBlock>
       <StackPanel Orientation="Vertical">
         <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
                 BorderThickness="1" Padding="15">
-          <TimePicker Header="Arrival time" MinuteIncrement="15" />
+          <TimePicker MinuteIncrement="15" />
         </Border>
         <Panel Background="{DynamicResource SystemControlBackgroundBaseLowBrush}">
           <TextBlock Padding="15">
             <TextBlock.Text>
               <x:String>
-                &lt;TimePicker Header="Arrival time" MinuteIncrement="15" /&gt;
+                &lt;TimePicker MinuteIncrement="15" /&gt;
               </x:String>
             </TextBlock.Text>
           </TextBlock>
@@ -107,13 +107,13 @@
       <StackPanel Orientation="Vertical">
         <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
                 BorderThickness="1" Padding="15">
-          <TimePicker ClockIdentifier="12HourClock" Header="12 hour clock" />
+          <TimePicker ClockIdentifier="12HourClock"/>
         </Border>
         <Panel Background="{DynamicResource SystemControlBackgroundBaseLowBrush}">
           <TextBlock Padding="15">
             <TextBlock.Text>
               <x:String>
-                &lt;TimePicker ClockIdentifier="12HourClock" Header="12 hour clock" /&gt;
+                &lt;TimePicker ClockIdentifier="12HourClock" /&gt;
               </x:String>
             </TextBlock.Text>
           </TextBlock>
@@ -124,13 +124,13 @@
       <StackPanel Orientation="Vertical">
         <Border BorderBrush="{DynamicResource SystemControlHighlightBaseLowBrush}"
                 BorderThickness="1" Padding="15">
-          <TimePicker ClockIdentifier="24HourClock" Header="24 hour clock" />
+          <TimePicker ClockIdentifier="24HourClock" />
         </Border>
         <Panel Background="{DynamicResource SystemControlBackgroundBaseLowBrush}">
           <TextBlock Padding="15">
             <TextBlock.Text>
               <x:String>
-                &lt;TimePicker ClockIdentifier="24HourClock" Header="24 hour clock" /&gt;
+                &lt;TimePicker ClockIdentifier="24HourClock" /&gt;
               </x:String>
             </TextBlock.Text>
           </TextBlock>
diff --git a/src/Avalonia.Controls/DateTimePickers/DatePicker.cs b/src/Avalonia.Controls/DateTimePickers/DatePicker.cs
index fb27feb521..bb05cd1b1f 100644
--- a/src/Avalonia.Controls/DateTimePickers/DatePicker.cs
+++ b/src/Avalonia.Controls/DateTimePickers/DatePicker.cs
@@ -40,18 +40,6 @@ namespace Avalonia.Controls
             AvaloniaProperty.RegisterDirect<DatePicker, bool>(nameof(DayVisible),
                 x => x.DayVisible, (x, v) => x.DayVisible = v);
 
-        /// <summary>
-        /// Defines the <see cref="Header"/> Property
-        /// </summary>
-        public static readonly StyledProperty<object> HeaderProperty =
-            AvaloniaProperty.Register<DatePicker, object>(nameof(Header));
-
-        /// <summary>
-        /// Defines the <see cref="HeaderTemplate"/> Property
-        /// </summary>
-        public static readonly StyledProperty<IDataTemplate> HeaderTemplateProperty =
-            AvaloniaProperty.Register<DatePicker, IDataTemplate>(nameof(HeaderTemplate));
-
         /// <summary>
         /// Defines the <see cref="MaxYear"/> Property
         /// </summary>
@@ -152,24 +140,6 @@ namespace Avalonia.Controls
             }
         }
 
-        /// <summary>
-        /// Gets or sets the DatePicker header
-        /// </summary>
-        public object Header
-        {
-            get => GetValue(HeaderProperty);
-            set => SetValue(HeaderProperty, value);
-        }
-
-        /// <summary>
-        /// Gets or sets the header template
-        /// </summary>
-        public IDataTemplate HeaderTemplate
-        {
-            get => GetValue(HeaderTemplateProperty);
-            set => SetValue(HeaderTemplateProperty, value);
-        }
-
         /// <summary>
         /// Gets or sets the maximum year for the picker
         /// </summary>
diff --git a/src/Avalonia.Controls/DateTimePickers/TimePicker.cs b/src/Avalonia.Controls/DateTimePickers/TimePicker.cs
index a709e4fb49..228b9ae205 100644
--- a/src/Avalonia.Controls/DateTimePickers/TimePicker.cs
+++ b/src/Avalonia.Controls/DateTimePickers/TimePicker.cs
@@ -34,18 +34,6 @@ namespace Avalonia.Controls
             AvaloniaProperty.RegisterDirect<TimePicker, int>(nameof(MinuteIncrement),
                 x => x.MinuteIncrement, (x, v) => x.MinuteIncrement = v);
 
-        /// <summary>
-        /// Defines the <see cref="Header"/> property
-        /// </summary>
-        public static readonly StyledProperty<object> HeaderProperty =
-            AvaloniaProperty.Register<TimePicker, object>(nameof(Header));
-
-        /// <summary>
-        /// Defines the <see cref="HeaderTemplate"/> property
-        /// </summary>
-        public static readonly StyledProperty<IDataTemplate> HeaderTemplateProperty =
-            AvaloniaProperty.Register<TimePicker, IDataTemplate>(nameof(HeaderTemplate));
-
         /// <summary>
         /// Defines the <see cref="ClockIdentifier"/> property
         /// </summary>
@@ -103,24 +91,6 @@ namespace Avalonia.Controls
             }
         }
 
-        /// <summary>
-        /// Gets or sets the header
-        /// </summary>
-        public object Header
-        {
-            get => GetValue(HeaderProperty);
-            set => SetValue(HeaderProperty, value);
-        }
-
-        /// <summary>
-        /// Gets or sets the header template
-        /// </summary>
-        public IDataTemplate HeaderTemplate
-        {
-            get => GetValue(HeaderTemplateProperty);
-            set => SetValue(HeaderTemplateProperty, value);
-        }
-
         /// <summary>
         /// Gets or sets the clock identifier, either 12HourClock or 24HourClock
         /// </summary>
diff --git a/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesDark.xaml b/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesDark.xaml
index 88b9f18eee..e480fb1670 100644
--- a/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesDark.xaml
+++ b/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesDark.xaml
@@ -358,7 +358,6 @@
     <x:Double x:Key="SliderOutsideTickBarThemeHeight">4</x:Double>
     <x:Double x:Key="SliderTrackThemeHeight">2</x:Double>
     <Thickness x:Key="SliderBorderThemeThickness">0</Thickness>
-    <FontWeight x:Key="SliderHeaderThemeFontWeight">Normal</FontWeight>
     <StaticResource x:Key="SliderContainerBackground" ResourceKey="SystemControlTransparentBrush" />
     <StaticResource x:Key="SliderContainerBackgroundPointerOver" ResourceKey="SystemControlTransparentBrush" />
     <StaticResource x:Key="SliderContainerBackgroundPressed" ResourceKey="SystemControlTransparentBrush" />
@@ -375,8 +374,6 @@
     <StaticResource x:Key="SliderTrackValueFillPointerOver" ResourceKey="SystemControlHighlightAccentBrush" />
     <StaticResource x:Key="SliderTrackValueFillPressed" ResourceKey="SystemControlHighlightAccentBrush" />
     <StaticResource x:Key="SliderTrackValueFillDisabled" ResourceKey="SystemControlDisabledChromeDisabledHighBrush" />
-    <StaticResource x:Key="SliderHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="SliderHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="SliderTickBarFill" ResourceKey="SystemControlForegroundBaseMediumLowBrush" />
     <StaticResource x:Key="SliderTickBarFillDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="SliderInlineTickBarFill" ResourceKey="SystemControlBackgroundAltHighBrush" />
@@ -424,7 +421,6 @@
     <!-- Resources for DatePicker.xaml-->
     <StaticResource x:Key="DatePickerSpacerFill" ResourceKey="SystemControlForegroundBaseLowBrush" />
     <StaticResource x:Key="DatePickerSpacerFillDisabled" ResourceKey="SystemControlDisabledBaseLowBrush" />
-    <StaticResource x:Key="DatePickerHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrush" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrushPointerOver" ResourceKey="SystemControlHighlightBaseMediumHighBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrushPressed" ResourceKey="SystemControlHighlightBaseMediumBrush" />
@@ -455,8 +451,6 @@
     <!-- Resources for TimePicker.xaml -->
     <StaticResource x:Key="TimePickerSpacerFill" ResourceKey="SystemControlForegroundBaseLowBrush" />
     <StaticResource x:Key="TimePickerSpacerFillDisabled" ResourceKey="SystemControlDisabledBaseLowBrush" />
-    <StaticResource x:Key="TimePickerHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="TimePickerHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrush" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrushPointerOver" ResourceKey="SystemControlHighlightBaseMediumHighBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrushPressed" ResourceKey="SystemControlHighlightBaseMediumBrush" />
@@ -595,7 +589,6 @@
     <StaticResource x:Key="CalendarDatePickerTextForeground" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="CalendarDatePickerTextForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerTextForegroundSelected" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="CalendarDatePickerHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerBackground" ResourceKey="SystemControlBackgroundAltMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerBackgroundPointerOver" ResourceKey="SystemControlPageBackgroundAltMediumBrush" />
     <StaticResource x:Key="CalendarDatePickerBackgroundPressed" ResourceKey="SystemControlBackgroundBaseLowBrush" />
diff --git a/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesLight.xaml b/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesLight.xaml
index b51a0bf259..4f421f64a7 100644
--- a/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesLight.xaml
+++ b/src/Avalonia.Themes.Fluent/Accents/FluentControlResourcesLight.xaml
@@ -354,7 +354,6 @@
     <x:Double x:Key="SliderOutsideTickBarThemeHeight">4</x:Double>
     <x:Double x:Key="SliderTrackThemeHeight">2</x:Double>
     <Thickness x:Key="SliderBorderThemeThickness">0</Thickness>
-    <FontWeight x:Key="SliderHeaderThemeFontWeight">Normal</FontWeight>
     <StaticResource x:Key="SliderContainerBackground" ResourceKey="SystemControlTransparentBrush" />
     <StaticResource x:Key="SliderContainerBackgroundPointerOver" ResourceKey="SystemControlTransparentBrush" />
     <StaticResource x:Key="SliderContainerBackgroundPressed" ResourceKey="SystemControlTransparentBrush" />
@@ -371,8 +370,6 @@
     <StaticResource x:Key="SliderTrackValueFillPointerOver" ResourceKey="SystemControlHighlightAccentBrush" />
     <StaticResource x:Key="SliderTrackValueFillPressed" ResourceKey="SystemControlHighlightAccentBrush" />
     <StaticResource x:Key="SliderTrackValueFillDisabled" ResourceKey="SystemControlDisabledChromeDisabledHighBrush" />
-    <StaticResource x:Key="SliderHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="SliderHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="SliderTickBarFill" ResourceKey="SystemControlForegroundBaseMediumLowBrush" />
     <StaticResource x:Key="SliderTickBarFillDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="SliderInlineTickBarFill" ResourceKey="SystemControlBackgroundAltHighBrush" />
@@ -420,7 +417,6 @@
     <!-- Resources for DatePicker.xaml-->
     <StaticResource x:Key="DatePickerSpacerFill" ResourceKey="SystemControlForegroundBaseLowBrush" />
     <StaticResource x:Key="DatePickerSpacerFillDisabled" ResourceKey="SystemControlDisabledBaseLowBrush" />
-    <StaticResource x:Key="DatePickerHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrush" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrushPointerOver" ResourceKey="SystemControlHighlightBaseMediumHighBrush" />
     <StaticResource x:Key="DatePickerButtonBorderBrushPressed" ResourceKey="SystemControlHighlightBaseMediumBrush" />
@@ -450,8 +446,6 @@
     <!-- Resources for TimePicker.xaml -->
     <StaticResource x:Key="TimePickerSpacerFill" ResourceKey="SystemControlForegroundBaseLowBrush" />
     <StaticResource x:Key="TimePickerSpacerFillDisabled" ResourceKey="SystemControlDisabledBaseLowBrush" />
-    <StaticResource x:Key="TimePickerHeaderForeground" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="TimePickerHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrush" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrushPointerOver" ResourceKey="SystemControlHighlightBaseMediumHighBrush" />
     <StaticResource x:Key="TimePickerButtonBorderBrushPressed" ResourceKey="SystemControlHighlightBaseMediumBrush" />
@@ -589,7 +583,6 @@
     <StaticResource x:Key="CalendarDatePickerTextForeground" ResourceKey="SystemControlForegroundBaseMediumBrush" />
     <StaticResource x:Key="CalendarDatePickerTextForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerTextForegroundSelected" ResourceKey="SystemControlForegroundBaseHighBrush" />
-    <StaticResource x:Key="CalendarDatePickerHeaderForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerBackground" ResourceKey="SystemControlBackgroundAltMediumLowBrush" />
     <StaticResource x:Key="CalendarDatePickerBackgroundPointerOver" ResourceKey="SystemControlPageBackgroundAltMediumBrush" />
     <StaticResource x:Key="CalendarDatePickerBackgroundPressed" ResourceKey="SystemControlBackgroundBaseLowBrush" />
diff --git a/src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml b/src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml
index 6f1e4fccfe..1585dada90 100644
--- a/src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml
@@ -28,7 +28,6 @@
     </Border>
   </Design.PreviewWith>
 
-  <Thickness x:Key="DatePickerTopHeaderMargin">0,0,0,4</Thickness>
   <x:Double x:Key="DatePickerFlyoutPresenterHighlightHeight">40</x:Double>
   <x:Double x:Key="DatePickerFlyoutPresenterItemHeight">40</x:Double>
   <x:Double x:Key="DatePickerFlyoutPresenterAcceptDismissHostGridHeight">41</x:Double>
@@ -84,18 +83,8 @@
     <Setter Property="Template">
       <ControlTemplate>
         <DataValidationErrors>
-          <Grid Name="LayoutRoot" Margin="{TemplateBinding Padding}" RowDefinitions="Auto,*">
-            <ContentPresenter Name="HeaderContentPresenter" Grid.Row="0"
-                              Content="{TemplateBinding Header}"
-                              Foreground="{DynamicResource DatePickerHeaderForeground}"
-                              ContentTemplate="{TemplateBinding HeaderTemplate}"
-                              Margin="{DynamicResource DatePickerTopHeaderMargin}"
-                              MaxWidth="{DynamicResource DatePickerThemeMaxWidth}"
-                              HorizontalAlignment="Stretch"
-                              VerticalAlignment="Top"/>
-
+          <Grid Name="LayoutRoot" Margin="{TemplateBinding Padding}">
             <Button Name="PART_FlyoutButton"
-                    Grid.Row="1"
                     Theme="{StaticResource FluentDatePickerFlyoutButton}"
                     Foreground="{TemplateBinding Foreground}"
                     Background="{TemplateBinding Background}"
diff --git a/src/Avalonia.Themes.Fluent/Controls/Slider.xaml b/src/Avalonia.Themes.Fluent/Controls/Slider.xaml
index 1e4a7ac097..f2351dd5be 100644
--- a/src/Avalonia.Themes.Fluent/Controls/Slider.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/Slider.xaml
@@ -99,18 +99,8 @@
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
                 CornerRadius="{TemplateBinding CornerRadius}">
-              <Grid
-                  Name="grid"
-                  Margin="{TemplateBinding Padding}"
-                  RowDefinitions="Auto, *">
-                <ContentPresenter
-                    x:Name="HeaderContentPresenter"
-                    Grid.Row="0"
-                    Margin="{DynamicResource SliderTopHeaderMargin}"
-                    TextElement.FontWeight="{DynamicResource SliderHeaderThemeFontWeight}"
-                    TextElement.Foreground="{DynamicResource SliderHeaderForeground}" />
                 <Grid x:Name="SliderContainer"
-                      Grid.Row="1"
+                      Margin="{TemplateBinding Padding}"
                       Background="{DynamicResource SliderContainerBackground}">
                   <Grid.Styles>
                     <Style Selector="TickBar">
@@ -191,7 +181,6 @@
                     </Track>
                   </Grid>
                 </Grid>
-              </Grid>
             </Border>
           </DataValidationErrors>
         </ControlTemplate>
@@ -205,19 +194,10 @@
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
                 CornerRadius="{TemplateBinding CornerRadius}">
-              <Grid
-                  Name="grid"
-                  Margin="{TemplateBinding Padding}"
-                  RowDefinitions="Auto, *">
-                <ContentPresenter
-                    x:Name="HeaderContentPresenter"
-                    Grid.Row="0"
-                    Margin="{DynamicResource SliderTopHeaderMargin}"
-                    TextElement.FontWeight="{DynamicResource SliderHeaderThemeFontWeight}"
-                    TextElement.Foreground="{DynamicResource SliderHeaderForeground}" />
                 <Grid x:Name="SliderContainer"
                       Grid.Row="1"
-                      Background="{DynamicResource SliderContainerBackground}">
+                      Background="{DynamicResource SliderContainerBackground}"
+                      Margin="{TemplateBinding Padding}">
                   <Grid.Styles>
                     <Style Selector="TickBar">
                       <Setter Property="ReservedSpace" Value="{Binding #PART_Track.Thumb.Bounds}" />
@@ -298,7 +278,6 @@
                     </Track>
                   </Grid>
                 </Grid>
-              </Grid>
             </Border>
           </DataValidationErrors>
         </ControlTemplate>
@@ -326,9 +305,6 @@
     <!--  Disabled State  -->
 
     <Style Selector="^:disabled">
-      <Style Selector="^ /template/ ContentPresenter#HeaderContentPresenter">
-        <Setter Property="Foreground" Value="{DynamicResource SliderHeaderForegroundDisabled}" />
-      </Style>
       <Style Selector="^ /template/ RepeatButton#PART_DecreaseButton">
         <Setter Property="Background" Value="{DynamicResource SliderTrackValueFillDisabled}" />
       </Style>
diff --git a/src/Avalonia.Themes.Fluent/Controls/TimePicker.xaml b/src/Avalonia.Themes.Fluent/Controls/TimePicker.xaml
index cb88eac2ba..2414ce096e 100644
--- a/src/Avalonia.Themes.Fluent/Controls/TimePicker.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/TimePicker.xaml
@@ -31,7 +31,6 @@
   <x:Double x:Key="TimePickerFlyoutPresenterItemHeight">40</x:Double>
   <x:Double x:Key="TimePickerSpacerThemeWidth">1</x:Double>
   <Thickness x:Key="TimePickerBorderThemeThickness">1</Thickness>
-  <Thickness x:Key="TimePickerTopHeaderMargin">0,0,0,4</Thickness>
   <x:Double x:Key="TimePickerFlyoutPresenterHighlightHeight">40</x:Double>
   <x:Double x:Key="TimePickerFlyoutPresenterAcceptDismissHostGridHeight">41</x:Double>
   <x:Double x:Key="TimePickerThemeMinWidth">242</x:Double>
@@ -83,19 +82,8 @@
     <Setter Property="Template">
       <ControlTemplate>
         <DataValidationErrors>
-          <Grid Name="LayoutRoot" Margin="{TemplateBinding Padding}" RowDefinitions="Auto,*">
-            <ContentPresenter x:Name="HeaderContentPresenter"
-                              Grid.Row="0"
-                              Content="{TemplateBinding Header}"
-                              ContentTemplate="{TemplateBinding HeaderTemplate}"
-                              Margin="{DynamicResource TimePickerTopHeaderMargin}"
-                              MaxWidth="{DynamicResource TimePickerThemeMaxWidth}"
-                              Foreground="{DynamicResource TimePickerHeaderForeground}"
-                              HorizontalAlignment="Stretch"
-                              VerticalAlignment="Top" />
-
+          <Grid Name="LayoutRoot" Margin="{TemplateBinding Padding}">
             <Button x:Name="PART_FlyoutButton"
-                    Grid.Row="1"
                     Theme="{StaticResource FluentTimePickerFlyoutButton}"
                     Foreground="{TemplateBinding Foreground}"
                     Background="{TemplateBinding Background}"
@@ -172,11 +160,7 @@
         </DataValidationErrors>
       </ControlTemplate>
     </Setter>
-
-    <Style Selector="^:disabled /template/ ContentPresenter#HeaderContentPresenter">
-      <Setter Property="Foreground" Value="{DynamicResource TimePickerHeaderForegroundDisabled}"/>
-    </Style>
-
+    
     <Style Selector="^:disabled /template/ Rectangle">
       <Setter Property="Fill" Value="{DynamicResource TimePickerSpacerFillDisabled}"/>
     </Style>
diff --git a/src/Avalonia.Themes.Simple/Controls/DatePicker.xaml b/src/Avalonia.Themes.Simple/Controls/DatePicker.xaml
index b4cf6313a6..30b7dc9ffa 100644
--- a/src/Avalonia.Themes.Simple/Controls/DatePicker.xaml
+++ b/src/Avalonia.Themes.Simple/Controls/DatePicker.xaml
@@ -30,7 +30,6 @@
     </Border>
   </Design.PreviewWith>
 
-  <Thickness x:Key="DatePickerTopHeaderMargin">0,0,0,4</Thickness>
   <x:Double x:Key="DatePickerFlyoutPresenterHighlightHeight">40</x:Double>
   <x:Double x:Key="DatePickerFlyoutPresenterItemHeight">40</x:Double>
   <x:Double x:Key="DatePickerFlyoutPresenterAcceptDismissHostGridHeight">41</x:Double>
@@ -91,19 +90,9 @@
       <ControlTemplate>
         <DataValidationErrors>
           <Grid Name="LayoutRoot"
-                Margin="{TemplateBinding Padding}"
-                RowDefinitions="Auto,*">
-            <ContentPresenter Name="HeaderContentPresenter"
-                              Grid.Row="0"
-                              MaxWidth="{DynamicResource DatePickerThemeMaxWidth}"
-                              Margin="{DynamicResource DatePickerTopHeaderMargin}"
-                              HorizontalAlignment="Stretch"
-                              VerticalAlignment="Top"
-                              Content="{TemplateBinding Header}"
-                              ContentTemplate="{TemplateBinding HeaderTemplate}" />
+                Margin="{TemplateBinding Padding}">
 
             <Button Name="PART_FlyoutButton"
-                    Grid.Row="1"
                     MinWidth="{DynamicResource DatePickerThemeMinWidth}"
                     MaxWidth="{DynamicResource DatePickerThemeMaxWidth}"
                     HorizontalAlignment="Stretch"
diff --git a/src/Avalonia.Themes.Simple/Controls/TimePicker.xaml b/src/Avalonia.Themes.Simple/Controls/TimePicker.xaml
index e02e3d8194..ef37230a1f 100644
--- a/src/Avalonia.Themes.Simple/Controls/TimePicker.xaml
+++ b/src/Avalonia.Themes.Simple/Controls/TimePicker.xaml
@@ -33,7 +33,6 @@
   <x:Double x:Key="TimePickerFlyoutPresenterItemHeight">40</x:Double>
   <x:Double x:Key="TimePickerSpacerThemeWidth">1</x:Double>
   <Thickness x:Key="TimePickerBorderThemeThickness">1</Thickness>
-  <Thickness x:Key="TimePickerTopHeaderMargin">0,0,0,4</Thickness>
   <x:Double x:Key="TimePickerFlyoutPresenterHighlightHeight">40</x:Double>
   <x:Double x:Key="TimePickerFlyoutPresenterAcceptDismissHostGridHeight">41</x:Double>
   <x:Double x:Key="TimePickerThemeMinWidth">242</x:Double>
@@ -90,20 +89,8 @@
       <ControlTemplate>
         <DataValidationErrors>
           <Grid Name="LayoutRoot"
-                Margin="{TemplateBinding Padding}"
-                RowDefinitions="Auto,*">
-            <ContentPresenter x:Name="HeaderContentPresenter"
-                              Grid.Row="0"
-                              MaxWidth="{DynamicResource TimePickerThemeMaxWidth}"
-                              Margin="{DynamicResource TimePickerTopHeaderMargin}"
-                              HorizontalAlignment="Stretch"
-                              VerticalAlignment="Top"
-                              Content="{TemplateBinding Header}"
-                              ContentTemplate="{TemplateBinding HeaderTemplate}"
-                              Foreground="{DynamicResource ThemeForegroundColor}" />
-
+                Margin="{TemplateBinding Padding}">
             <Button x:Name="PART_FlyoutButton"
-                    Grid.Row="1"
                     MinWidth="{DynamicResource TimePickerThemeMinWidth}"
                     MaxWidth="{DynamicResource TimePickerThemeMaxWidth}"
                     HorizontalAlignment="Stretch"
@@ -181,10 +168,6 @@
       </ControlTemplate>
     </Setter>
 
-    <Style Selector="^:disabled /template/ ContentPresenter#HeaderContentPresenter">
-      <Setter Property="TextElement.Foreground" Value="{DynamicResource ThemeForegroundBrush}" />
-    </Style>
-
     <Style Selector="^:disabled /template/ Rectangle">
       <Setter Property="Opacity" Value="{DynamicResource ThemeDisabledOpacity}" />
     </Style>
diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/Avalonia.Markup.Xaml.Loader.csproj b/src/Markup/Avalonia.Markup.Xaml.Loader/Avalonia.Markup.Xaml.Loader.csproj
index ce931b9c14..debdece60f 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/Avalonia.Markup.Xaml.Loader.csproj
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/Avalonia.Markup.Xaml.Loader.csproj
@@ -5,6 +5,11 @@
     <IsPackable>true</IsPackable>
     <PackageId>Avalonia.Markup.Xaml.Loader</PackageId>
     <DefineConstants>$(DefineConstants);XAMLX_INTERNAL</DefineConstants>
+    <LangVersion>10</LangVersion>
+  </PropertyGroup>
+  <!--Disable Net Perf. analyzer for submodule to avoid commit issue -->
+  <PropertyGroup>
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
   </PropertyGroup>
   <Import Project="IncludeXamlIlSre.props" />
   <ItemGroup>
diff --git a/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj b/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj
index dadef1cb9c..0c0fe5b921 100644
--- a/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj
+++ b/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj
@@ -3,6 +3,10 @@
     <OutputType>Exe</OutputType>
     <TargetFrameworks>net461;netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
+  <!--Disable Net Perf. analyzer for submodule to avoid commit issue -->
+  <PropertyGroup>
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
+  </PropertyGroup>  
   <ItemGroup>
     <ProjectReference Include="..\..\Avalonia.DesignerSupport\Avalonia.DesignerSupport.csproj" />
     <ProjectReference Include="..\..\Markup\Avalonia.Markup.Xaml\Avalonia.Markup.Xaml.csproj" />