Thank you for contacting us.
To achieve the scenario you mention I suggest you try to place the RadMenu in an UpdatePanel, for example. When clicking on an item in the menu add the corresponding dock in the way demonstrated in the MyPortal
example and delete the clicked item from the menu as shown in the Add/Remove/Disable Items online example
of the RadMenu. On closing a dock you can
add the needed item in the menu at dock's Command server-side event
and manually update the UpdatePanel in which the RadMenu control is placed.
Let us know if you need further assistance.
the Telerik team