Colors appear duplicated when template is moved to GlobalResources and edited from a stage button.

There is another issue related when template is moved to GlobalResources. If you edit it directly from the Resources tab, by clicking in the pencil/edit button, which shows the dummy editor, then selecting a color resource fails and renders nothing (it appears as #00FFFFFF):

1. Create some Color resources (in GlobalResources)
2. Create a Button template and move it to GlobalResources
3. Go to Resources tab and edit the button template (hit the pencil button in the resource)
4. Select the border background and assign a Color resource, it will appear as #00FFFFFF