We are planning to create a theme that will look like the default theme for Silverlight but currently we do not have such resources. You can find the TabControl styles here
. And the Telerik RadTabControls should be available in your installation folder. For example on my computer they are located here:
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q1 2011 SP1\Themes\OfficeBlack\Themes\Office\Black\TabControl.xaml
You can try to modify the telerik RadTabControl's ControlTemplate however if you do not have good skills in XAML you would find it difficult and I would rather suggest us to release the Silverlight theme or use the Office_Blue or Windows7 theme available now.
the Telerik team
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