You can edit the ControlTemplate
of the RadTabitem
in the Expression Blend
and use the SelectionVisual
in order to style the tab items when they are selected or unselected accordingly. The described approach is used in the attached solution. You can give it a try and let us know if it satisfies you.
Feel free to ask if you need more info. We would be glad to assist you further.
the Telerik team
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to help you get started with RadControls for WPF