Currently, Setters can be created which contain Conditions which fire the Setter if these Conditions are met.

Each Condition contains a 'Value' field which works without issue when a Value is hand-typed.

In theory, the 'Value' field also offers the ability to Apply a Resource, and to use that as a value.

In Studio, hitting the 'Apply Resource' button however doesn't invite the user to select from any of the available Resources.

Repro Steps:

1) Create a Studio Project featuring a MainPage.xaml

2) From the Resources Panel, create a new SolidColor Resource of your choice, saved inside the GlobalResources dictionary.

3) Introduce a Button Element to the Stage, and create a new Template for it.
This will open the Button's Inline Template Editor.

4) Still within the Button's Template, navigate to the Interactivity/Setters Panel, and remove all current Setters.

5) Create a new Setter with a SourceName of 'Self', set its Property to 'Foreground', then hover over its 'Value' 3-Dot menu, and select 'Apply Resource'.

Observe no Resource Selection interface appears in the Panel, and it is not possible to set the SolidColor Resource created in Step 2).

Expected Results: Clicking on the 'Apply Resource' function invites the user to select from a selection of available Project Resources.