I see now. So your request is to have the multiple selection only when the ListPicker popup is opened?
If so - I would say that the better approach is to have a RadPickerBox and to have the RadDataBoundListBox as a content of the PickerBox.
We really want to keep the RadListPicker as simple as it is now. If we have to add all these options to the list picker they will work only for the popup mode of this control, and the API will be very complicated.
What do you think about this approach? To have a simple RadPickerBox containing a simple RadDataBoundListBox that supports fildering, multiple selection, sorting, etc.
All the best,
the Telerik team
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