Register SyncContext in RegisterServices

src/Perspex.Application/Application.cs

@@ -55,7 +55,7 @@ namespace Perspex
             {
                 throw new InvalidOperationException("Cannot create more than one Application instance.");
             }
-            PerspexSynchronizationContext.InstallIfNeeded();
+
             Current = this;
         }
 
@@ -150,6 +150,7 @@ namespace Perspex
         /// </summary>
         protected virtual void RegisterServices()
         {
+            PerspexSynchronizationContext.InstallIfNeeded();
             this.FocusManager = new FocusManager();
             this.InputManager = new InputManager();
 

src/Perspex.Base/PerspexObject.cs

@@ -4,8 +4,6 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-using Perspex.Threading;
-
 namespace Perspex
 {
     using System;
@@ -102,7 +100,6 @@ namespace Perspex
         /// </summary>
         public PerspexObject()
         {
-            PerspexSynchronizationContext.InstallIfNeeded();
             this.propertyLog = Log.ForContext(new[]
             {
                 new PropertyEnricher("Area", "Property"),

src/Perspex.Base/Threading/PerspexSynchronizationContext.cs

@@ -1,12 +1,12 @@
-using System.Threading;
-
-namespace Perspex.Threading
+namespace Perspex.Threading
 {
     using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text;
     using System.Threading.Tasks;
+    using System.Threading;
+
 
     /// <summary>
     /// SynchronizationContext to be used on main thread
@@ -14,7 +14,7 @@ namespace Perspex.Threading
     public class PerspexSynchronizationContext : SynchronizationContext
     {
         /// <summary>
-        /// Controls if SynchronizationContext should be installed in InstallIfNeeded
+        /// Controls if SynchronizationContext should be installed in InstallIfNeeded. Used by Designer.
         /// </summary>
         public static bool AutoInstall { get; set; } = true;