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To achieve your goal you can implement conditional docking. You can find more information in this help article: http://www.telerik.com/help/silverlight/raddocking-how-to-implement-conditional-docking.html
and a sample project in this blog post: http://blogs.telerik.com/silverlightteam/posts/09-12-29/using_compass_indicators_properties_for_telerik_s_docking_control_for_silverlight_and_wpf.aspx
Hope this information helps. If you need further assistance please let us know.
All the best,
the Telerik team
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