In order to remove any state from the Item of the RadPanelBar control you have to edit the
control template of
the RadPanelBarItem in Blend. For more information you can follow the link below:
If you have further questions please do not hesitate to ask us.
I hope this will help you.
On a side note, I'd like to inform you that we've just released an online tool that allows you to reduce the size of your Silverilght applications. For more information, please visit http://blogs.telerik.com/blogs/posts/10-06-10/telerik_assembly_minifier.aspx
the Telerik team
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