Currently, there appears to be an intermittent bug where Dictionaries that have been merged (either directly, or via a proxy Dictionary), don't display in the list of available Resources to apply. In this case, it manifest as available Dictionaries not being visible in the 'Create in' dialogue for Templates or Styles.

Video attached.

Repro Steps:

1) Create a new Project featuring a MainPage.xaml

2) In the Project Root, create a new ResourceDictionary named "Dictionary_Master_1.xaml"

3) In the Project Root, create a new ResourceDictionary named "Dictionary_Colors_1.xaml"

4) From the Resources Panel, merge 'Dictionary_Master_1.xaml' into the GlobalResources Dictionary.

5) Select 'Dictionary_Master_1.xaml' so that its tab is open.

6) Merge 'Dictionary_Colors_1.xaml' into 'Dictionary_Master_1.xaml'

7) From the Assets Panel, create a new Page named "MyGym.xaml", and introduce a Buttonn Element to it.

8) Return to the Assets Panel, and under the Project Root, create a new ResourceDictionary named "Dictionary_Typography_1.xaml".

9) Open the Dictionary_1_Master.xaml tab, and in the Resources Panel, merge 'Dictionary_Typography_1.xaml' into 'Dictionary_1_Master.xaml'

10) Return to the 'MyGym.xaml' Page, right-click on the Button on the Stage, and from its Context Menu, select the 'Create' option under either the Templates or Styles Context Menu category.

11) In the 'Create Resource' module, from the 'Create in' Dropdown menu, search for 'Dictionary_Typography_1.xaml'.

Observe how this ResourceDictionary is not available to be selected.

11) Close and re-open 'MyGym.xaml'

12) Attempt to create a new Template or Style from the Button on-Stage once again.

Observe, how now, the 'Dictionary_Typography_1.xaml' ResourceDictionary is available for selection from the listing.

Expected Results: Available Dictionaries are made immediately available to all parts of the interface that can access and select them.