Thank you for contacting us.
If you want to "freeze" some docking parts, I would suggest referring to the following online article - http://www.telerik.com/help/wpf/raddocking-how-to-freeze-the-layout.html. This article describes how to prevent the pane from pinning/unpinning, floating, closing and resizing.
Hope this helps. Please do not hesitate to contact us if you require any further information.
the Telerik team
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