That is correct. This will disable the floating function and you will only be able to rearrange tabs of DocumentWindows.
Going through the thread again I think I misunderstood you initially. What I can offer for this case is to remove the previously provided code and use the preview drag mode of the windows together with the TransactionCommiting event:
DragDropService service =
service.DragDropMode = DragDropMode.Preview;
radDock1.TransactionCommitting += radDock1_TransactionCommitting;
sender, RadDockTransactionCancelEventArgs e)
e.Cancel = e.Transaction
More on the drag drop service can be found here: http://www.telerik.com/help/winforms/dock-architecture-and-features-using-the-dragdropservice.html
I hope that you find this information useful.
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