Added a simple test to verify that file path strings is parsed correctly.

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/XamlDom/SimpleLoadTests.cs

@@ -97,6 +97,19 @@ namespace ICSharpCode.WpfDesign.Tests.XamlDom
 			");
 		}
 		
+		[Test]
+		public void ExampleClassWithFilePathStringPropAttribute()
+		{
+			TestLoading(@"
+<t:ExampleClass
+  xmlns=""http://schemas.microsoft.com/netfx/2007/xaml/presentation""
+  xmlns:t=""" + XamlTypeFinderTests.XamlDomTestsNamespace + @"""
+  xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
+  StringProp=""C:\Folder A\Sub,Folder,A\SubFolderB\file,with,commas and spaces.txt"">
+</t:ExampleClass>
+			");
+		}
+		
 		[Test]
 		public void ExampleClassUseDefaultProperty()
 		{