Make Microsoft.PowerShell.GraphicalHost buildable

-Exclude *Button files
-Remove unnessasary namespace specifier for resources

src/Microsoft.PowerShell.GraphicalHost/commandHelpers/ShowCommandHelper.cs

@@ -1303,7 +1303,7 @@ Function PSGetSerializedShowCommandInfo
                 MessageBox.Show(
                     String.Format(
                         CultureInfo.CurrentUICulture,
-                        Microsoft.Management.UI.Internal.ShowCommandResources.EndProcessingErrorMessage,
+                        ShowCommandResources.EndProcessingErrorMessage,
                         errorString),
                      "Show-Command",
                      MessageBoxButton.OK,

src/Microsoft.PowerShell.GraphicalHost/commandHelpers/outgridview.cs

@@ -75,12 +75,12 @@ namespace Microsoft.Management.UI.Internal
         /// <summary>
         /// OK Button's content.
         /// </summary>
-        private static readonly string OKButtonContent = Microsoft.Management.UI.Internal.XamlLocalizableResources.OutGridView_Button_OK;
+        private static readonly string OKButtonContent = XamlLocalizableResources.OutGridView_Button_OK;
         
         /// <summary>
         /// Cancel Button's content.
         /// </summary>
-        private static readonly string CancelButtonContent = Microsoft.Management.UI.Internal.XamlLocalizableResources.OutGridView_Button_Cancel;
+        private static readonly string CancelButtonContent = XamlLocalizableResources.OutGridView_Button_Cancel;
         
         /// <summary>
         /// Used to store selected items in the ok processing