Currently, there appears to be an issue where if a Timeline Event is created within a DataTemplate, the list of Properties available to select from in a ChangePropertyAction are largely missing.

This issue does not appear to occur outside of a DataTemplate (eg: on a Page).

See attached video.

Repro Steps:

1) Create a Studio Project featuring a MainPage.xaml, and introduce a ContentControl Element to the Page.

2) Create a Content Template for the ContentControl. This will open it up in the Inline Dummy Template Editor.

3) Within the Template, introduce a ListBox Element, and give it a unique name.

4) Still within the Template, navigate to the Animation/Storyboard tab, and create a new Storyboard.

5) On the Storyboard, create a Timeline Event, and create a new 'ChangePropertyAction' on it.

6) In the 'Target' sub-Property, select the ListBox named in Step 3).

7) Click on the ComboBox for 'Property Name'.

Observe how the Properties shown are not the expected Properties for a ListBox.

8) Save all open documents, then close all open documents.

7) Re-open MainPage.xaml, and navigate back to the Storyboard created in Step 4), and select the keyframe of the Timeline Event.

8) Within the Event's Properties Panel, click on the ComboBox for the 'Properties' again, as done in Step 7).

Observe how now no Properties appear at all.

Expected Results: The 'Properties' ComboBox displays all available Properties for the Element set as the 'Target'.