I answered to your ticket, but I am posting my reply here as well, you can continue either thread:
It is possible to drag items within a StackPanel, in fact I created an example which shows how you can rearrange items in a ListBox (which uses a StackPanel) and drag them to and from a WrapPanel.
You can find the example here:
And the example with the ListBox on its own here:
If you like to have richer user experience with the dragging cues available to the users, please consider using an ItemsControl instead of a stack. This way you will be able to also bind it and it has a ControlTemplate which can be modified to suit different needs (as with the DragDrop in this case). Visually the ItemsControl and the StackPanel will look identical. If you want you can convert the ListBox from the example to an ItemsControl by changing its name and modifying the ControlTemplate a bit.
I will be happy to help you with any questions you have,
the Telerik team
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