[WPF] Add Separator menu item

Xwt.WPF/Xwt.WPF.csproj

@@ -82,6 +82,7 @@
     <Compile Include="Xwt.WPFBackend\ScrollViewBackend.cs" />
     <Compile Include="Xwt.WPFBackend\SelectFolderDialogBackend.cs" />
     <Compile Include="Xwt.WPFBackend\SeparatorBackend.cs" />
+    <Compile Include="Xwt.WPFBackend\SeparatorMenuItemBackend.cs" />
     <Compile Include="Xwt.WPFBackend\TextEntryBackend.cs" />
     <Compile Include="Xwt.WPFBackend\TextLayoutBackendHandler.cs" />
     <Compile Include="Xwt.WPFBackend\TextLayoutContext.cs" />

Xwt.WPF/Xwt.WPFBackend/SeparatorMenuItemBackend.cs

@@ -0,0 +1,40 @@
+//
+// SeparatorMenuItemBackend.cs
+//
+// Author:
+//       Eric Maupin <ermau@xamarin.com>
+//
+// Copyright (c) 2012 Xamarin, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using Xwt.Backends;
+using SWC = System.Windows.Controls;
+
+namespace Xwt.WPFBackend
+{
+	public class SeparatorMenuItemBackend
+		: MenuItemBackend, ISeparatorMenuItemBackend
+	{
+		public SeparatorMenuItemBackend()
+			: base (new SWC.Separator())
+		{
+		}
+	}
+}

Xwt.WPF/Xwt.WPFBackend/WPFEngine.cs

@@ -49,6 +49,7 @@ namespace Xwt.WPFBackend
 			WidgetRegistry.RegisterBackend (typeof (Menu), typeof (MenuBackend));
 			WidgetRegistry.RegisterBackend (typeof (MenuItem), typeof (MenuItemBackend));
 			WidgetRegistry.RegisterBackend (typeof (CheckBoxMenuItem), typeof (CheckboxMenuItemBackend));
+			WidgetRegistry.RegisterBackend (typeof (SeparatorMenuItem), typeof (SeparatorMenuItemBackend));
 			WidgetRegistry.RegisterBackend (typeof (Table), typeof (BoxBackend));
 			WidgetRegistry.RegisterBackend (typeof (Box), typeof (BoxBackend));
 			WidgetRegistry.RegisterBackend (typeof (Label), typeof (LabelBackend));