Make sure static ctor is run when looking up PPs.

src/Markup/Perspex.Markup.Xaml/Converters/PerspexPropertyTypeConverter.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Globalization;
 using System.Linq;
-using System.Runtime.CompilerServices;
 using OmniXaml;
 using OmniXaml.TypeConversion;
 using Perspex.Styling;
@@ -55,9 +54,6 @@ namespace Perspex.Markup.Xaml.Converters
                 }
             }
 
-            // Ensure the type's static ctor has been run.
-            RuntimeHelpers.RunClassConstructor(type.TypeHandle);
-
             // First look for non-attached property on the type and then look for an attached property.
             var property = PerspexPropertyRegistry.Instance.FindRegistered(type, s);
             

src/Perspex.Base/PerspexPropertyRegistry.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 
 namespace Perspex
 {
@@ -61,6 +62,9 @@ namespace Perspex
 
             while (type != null)
             {
+                // Ensure the type's static ctor has been run.
+                RuntimeHelpers.RunClassConstructor(type.TypeHandle);
+
                 List<PerspexProperty> list;
 
                 if (_registered.TryGetValue(type, out list))