Currently, when creating Data Structures and their Data Properties, it is possible to set any Data Property to be served as a 'Collection'.

However, whilst this works as expected when setting a Collection for a Data Structure, for the following Property Types; it is non-functional:

• Number
• String
• Boolean
• Font Family
• ImageSource
• Brush
• Command
• Enum

Repro Steps:

[Sample Project Attached that can allow you to skip directly to Step 6)]

1) Create a Page containing a MainPage.xaml
2) Create a DataStructure containing one of each of the following, with each set to serve a 'Collection': Number| String | Boolean | FontFamily | ImageSource | Brush | Command | Enum
3) Create a DataSet for the DataStructure created in Step 2), then select it to make the DataSet appear in the Properties Panel.
4) From the DataSet Properties Panel, generate a new set of Sample Data for the DataSet created in Step 3).

5) Observe how all of the Properties created in Step 2) are present, and accompanied by a '+' (Add Item) button.
6) Click on any of the '+' (Add Item) buttons.

Observe performing this action doesn't result in any result.

Expected Results: Collections can be created for any Data Property type, and the members of the Collection can be created within a Data Set.