Repro Steps:

1) Create a Page
2) Select the root Page in the Navigator
3) Navigate to the Resources Panel
4) Hover over the '[Page]' line under MainPage.xaml, and click the plus icon and select 'Create Dictionary'.

Observe how 'ResourceDictionaryX.xaml' now appears under the [Page] line.

5) Select the Root Grid from the Navigator.
6) Hover over the '[Grid]' line under MainPage.xaml, and click the plus icon and select 'Create Dictionary'.

Observe how the [Grid] disappears from the Resources Panel, consequently removing the visual feedback that exists for the Page, that shows the new ResourceDictionary created within it.

7) Click on the Root Grid once again within the navigator.

Observe how the ResourceDictionary for the element is now visible within the Resources Panel.

Expected Results:
Creating a Dictionary within an Element doesn't deselect the element, provides the same immediate visual feedback as creation within a Page.