The described functionality can be implemented by attaching an event handler to the RadDock's event OnClientDragEnd
and writing some additional client script in order to check whether a dock control is in a particular zone and to specify its behavior in case it is out of this zone.
For your convenience I have attached a sample page, implementing the described approach. Please use it as a base for your further development.
Note that the RadWindow control provides a Restriction Zone functionality
, so you may consider using it in your scenario.
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