Thanks for your question.
It is possible to change the color of the GroupCaptionFill for the selected state of the group by using the Visual Style Builder. You can do this by following these steps:
1. Open Visual Style Builder.
2. Select RadPanelBar control from the tree view on the left.
3. Expand RadPanelbar child nodes and select GroupCaptionFill
4. Define a style for the GroupCaptionFill.Selected state.
Please note that GroupCaptionFill.Selected state has been introduced in Q1 2010 SP1 which we released yesterday. So please update your version to the latest one.
I hope this helps.
the Telerik team
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