I have attached an updated version of the DataForm example from our QSF (found in C:\Program Files (x86)\Telerik\UI for Windows Phone 8 folder). This version features an updated template of RadListPicker, which uses RadJumpList with a group descriptor. Tthis approach relies on the fact, that there is a control in RadListPicker's template, that is named PopupList
and it is of type RadDataBoundListBox (RadJumpList inherits from it).
You can extend this approach further by adding additional controls and features to the RadListPicker custom template, keeping the above requirement satisfied.
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