Currently, if a ContentControl Content Template is opened for edit from the Resources Panel, and any changes are made to its Properties, these changes will not update on-Stage until the Page is closed and re-opened.

This can lead to situations where it appears as though changes made, and saved, have failed to apply.

See attached video.

Repro Steps:

1) Download, unzip, and open the attached Studio Project.

2) Take a moment to observe the sizing of the Cup icon in the 'Drink' slot on the right of the screen in the 'My Order' section.

3) Navigate to the Resources Panel, and under GlobalResources.xaml, find, identify, then select the merged 'Icon_Resources.xaml'.

4) Within 'Icon_Resources.xaml' , identify the 'ContentControl_Content_Icon_ItemType_Drink_Template' Resource, then hover over it, and click its Pencil icon to edit it.
This will open it in the Resource-Panel-Based Template Editor.

5) Expand the Elements in the Navigator, and identify, then select the 'IconMarginer_Grid' Grid Element to expose its Properties Panel.

6) Set the Margin Property value of 'IconMarginer_Grid' to somewhere between 32 and 64 pixels all around.

7) Save all open documents, then press the 'Home' icon in the top left of the Template Editor to return to MainPage.xaml

8) Observe how the size of the Drink's 'Cup' icon has not resized.

9) Close, then re-open MainPage.xaml.

Observe how now, the size of the Drink's 'Cup' icon has now resized as expected following the operation in Step 6).

Expected Results: Property value changes to a Template's content immediately apply and are visible on-Stage without having to close and re-open any open documents.