Thank you for contacting us.
By your screenshot I can say that your are using our old DockingManager control. Indeed, we have an issue with its themes in Q1 2010 SP2. I am attaching a sample project containing the theme needed for this control. Please note, however, that DockingManager is obsolete and it has already been removed from our ToolBox. I would suggest that you use our new RadDock
control instead. It is supported by the new Visual Style Builder
and it has many performance and memory footprint optimizations compared to the old control.
the Telerik team
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