Currently, it is possible to apply a DataTemplate to a variety of Elements.

However, it appears as though it is not possible to apply a DataTemplate to a compatible Element until there is some degree of fill-out of the DataSet's Values, even when the target Element is provided the correct DataContext.

See attached video.

Repro Steps:

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

2) Navigate to the Data Panel, select the ViewMode, and in its Properties Panel, add a new Data Property named 'Slot' of Type 'FastFoodItem'
(FastFoodItem is what the items in the left side grid are using)

3) Navigate to the ViewModel's DataSet, and ensure that 'Slot' has 'None' selected under it.

4) Right-Click on the ContentControl on the right of the Stage (that has the 'Hello! Edit me!' Text), and navigate to 'Templates'-->'Content'.
Observe how no DataTemplates are available to pick from.

5) In the ContentControl's 'Content' field, hover over it, click on its 3-Dot menu, and select 'Create Binding'. Then, bind it to the 'Slot' Data Property.

6) Right-Click on the ContentControl on the right of the Stage once again, and navigate to 'Templates'-->'Content'.
Observe how no DataTemplates are available to pick from.

7) Navigate to the ViewModel's DataSet, open the 'Slot' dropdown, and select 'FastFoodItem'.

8) Right-Click on the ContentControl on the right of the Stage once again, and navigate to 'Templates'-->'Content'.
Observe how now there are multiple Templates to select from.

Expected Results: Templates should in theory be available to select from, from the moment the DataContext is set on the Element, and shouldn't require Data Set Values to be filled out to be detected.