No, it's a feature of the tabbed data-entry dialog from the example application.
Checkboxes are used and allow for multiple Attribute selection within a Group. Radio Buttons are also used for making a selection, but within the Group of available Attributes a rule has been applied (coded) that enforces uniqueness (only one selection can be made).
This is more a case of controlling data input, but I did find it to be an interersting implementation.
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