Thank you for writing.
The group picker choose the appropriate item template when it is open. This means that if by the time you open the group picker a certain group has no items it should have the EmptyItemTemplate, unless the group picker was open before the ItemsSource has been cleared. If this behavior differs from the one you observe, please send us a sample project which we can further investigate and tell what you what's wrong.
I hope this information helps.
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