Moved VisualTree extensions into own namespace.

So that they don't pollute the whole Perspex namespace - you now need to
"opt-in" to the visual tree.

Perspex.Controls.UnitTests/ContentControlTests.cs

@@ -16,6 +16,7 @@ namespace Perspex.Controls.UnitTests
     using Perspex.Layout;
     using Perspex.Platform;
     using Perspex.Styling;
+    using Perspex.VisualTree;
     using Ploeh.AutoFixture;
     using Ploeh.AutoFixture.AutoMoq;
     using Splat;

Perspex.Controls.UnitTests/TemplatedControlTests.cs

@@ -14,6 +14,7 @@ namespace Perspex.Controls.UnitTests
     using Microsoft.VisualStudio.TestTools.UnitTesting;
     using Perspex.Controls;
     using Perspex.Controls.Primitives;
+    using Perspex.VisualTree;
 
     [TestClass]
     public class TemplatedControlTests

Perspex.Controls/ControlExtensions.cs

@@ -11,6 +11,7 @@ namespace Perspex.Controls
     using System.Linq;
     using Perspex.Controls;
     using Perspex.Styling;
+    using Perspex.VisualTree;
 
     public static class ControlExtensions
     {

Perspex.Controls/DataTemplateExtensions.cs

@@ -7,6 +7,7 @@
 namespace Perspex.Controls
 {
     using System.Linq;
+    using Perspex.VisualTree;
     using Splat;
 
     public static class DataTemplateExtensions

Perspex.Controls/GridSplitter.cs

@@ -9,6 +9,7 @@ namespace Perspex.Controls
     using System;
     using Perspex.Controls.Primitives;
     using Perspex.Input;
+    using Perspex.VisualTree;
 
     public class GridSplitter : Thumb
     {

Perspex.Controls/Presenters/ScrollContentPresenter.cs

@@ -10,6 +10,7 @@ namespace Perspex.Controls.Presenters
     using System.Linq;
     using Perspex.Input;
     using Perspex.Layout;
+    using Perspex.VisualTree;
 
     public class ScrollContentPresenter : ContentPresenter
     {

Perspex.Controls/Presenters/TextPresenter.cs

@@ -15,6 +15,7 @@ namespace Perspex.Controls
     using Perspex.Input;
     using Perspex.Media;
     using Perspex.Threading;
+    using Perspex.VisualTree;
 
     public class TextPresenter : TextBlock
     {

Perspex.Controls/Primitives/SelectingItemsControl.cs

@@ -12,6 +12,7 @@ namespace Perspex.Controls.Primitives
     using Perspex.Controls.Presenters;
     using Perspex.Input;
     using Perspex.Interactivity;
+    using Perspex.VisualTree;
 
     public class SelectingItemsControl : ItemsControl
     {

Perspex.Controls/Primitives/TemplatedControl.cs

@@ -10,6 +10,7 @@ namespace Perspex.Controls.Primitives
     using System.Linq;
     using Perspex.Media;
     using Perspex.Styling;
+    using Perspex.VisualTree;
     using Splat;
 
     public class TemplatedControl : Control, ITemplatedControl

Perspex.Controls/RadioButton.cs

@@ -9,6 +9,7 @@ namespace Perspex.Controls
     using System;
     using System.Linq;
     using Perspex.Controls.Primitives;
+    using Perspex.VisualTree;
 
     public class RadioButton : ToggleButton
     {

Perspex.Controls/TreeViewItem.cs

@@ -10,6 +10,7 @@ namespace Perspex.Controls
     using System.Linq;
     using Perspex.Controls.Generators;
     using Perspex.Controls.Primitives;
+    using Perspex.VisualTree;
 
     public class TreeViewItem : HeaderedItemsControl, ISelectable
     {

Perspex.Input/FocusManager.cs

@@ -10,6 +10,7 @@ namespace Perspex.Input
     using System.Collections.Generic;
     using System.Linq;
     using Perspex.Interactivity;
+    using Perspex.VisualTree;
     using Splat;
 
     public class FocusManager : IFocusManager

Perspex.Input/InputElement.cs

@@ -10,6 +10,7 @@ namespace Perspex.Input
     using System.Linq;
     using Perspex.Interactivity;
     using Perspex.Rendering;
+    using Perspex.VisualTree;
 
     public class InputElement : Interactive, IInputElement
     {

Perspex.Input/InputManager.cs

@@ -11,6 +11,7 @@ namespace Perspex.Input
     using System.Linq;
     using System.Reactive.Subjects;
     using Perspex.Input.Raw;
+    using Perspex.VisualTree;
 
     public class InputManager : IInputManager
     {

Perspex.Input/MouseDevice.cs

@@ -12,6 +12,7 @@ namespace Perspex.Input
     using Perspex.Input.Raw;
     using Perspex.Interactivity;
     using Perspex.Platform;
+    using Perspex.VisualTree;
     using Splat;
 
     public abstract class MouseDevice : IMouseDevice

Perspex.Interactivity/Interactive.cs

@@ -12,6 +12,7 @@ namespace Perspex.Interactivity
     using System.Reactive;
     using System.Reactive.Linq;
     using Perspex.Layout;
+    using Perspex.VisualTree;
 
     public class Interactive : Layoutable, IInteractive
     {

Perspex.Layout/LayoutManager.cs

@@ -10,6 +10,7 @@ namespace Perspex.Layout
     using System.Reactive;
     using System.Reactive.Subjects;
     using NGenerics.DataStructures.General;
+    using Perspex.VisualTree;
 
     /// <summary>
     /// Manages measuring and arranging of controls.

Perspex.Layout/Layoutable.cs

@@ -8,6 +8,7 @@ namespace Perspex.Layout
 {
     using System;
     using System.Linq;
+    using Perspex.VisualTree;
     using Splat;
 
     public enum HorizontalAlignment

Perspex.SceneGraph.UnitTests/VisualTests.cs

@@ -8,6 +8,7 @@ namespace Perspex.SceneGraph.UnitTests
 {
     using System.Linq;
     using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using Perspex.VisualTree;
 
     [TestClass]
     public class VisualTests

Perspex.SceneGraph/Perspex.SceneGraph.csproj

@@ -91,7 +91,7 @@
     <Compile Include="Thickness.cs" />
     <Compile Include="Vector.cs" />
     <Compile Include="Visual.cs" />
-    <Compile Include="VisualExtensions.cs" />
+    <Compile Include="VisualTree\VisualExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="Splat">

Perspex.SceneGraph/Visual.cs

@@ -15,6 +15,7 @@ namespace Perspex
     using Perspex.Collections;
     using Perspex.Media;
     using Perspex.Rendering;
+    using Perspex.VisualTree;
     using Splat;
 
     public class Visual : Animatable, IVisual

Perspex.SceneGraph/VisualExtensions.cs → Perspex.SceneGraph/VisualTree/VisualExtensions.cs

@@ -4,7 +4,7 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-namespace Perspex
+namespace Perspex.VisualTree
 {
     using System;
     using System.Collections.Generic;

Perspex.Styling/Styler.cs

@@ -8,6 +8,7 @@ namespace Perspex.Styling
 {
     using System;
     using System.Linq;
+    using Perspex.VisualTree;
     using Splat;
 
     public class Styler : IStyler