Hello Tim,
If you only want to make the background of a selected item transparent, then it would be best to edit the
ControlTemplate of the
RadOutlookBarItem. I am not sure why you experienced an exception, but if you can give us more details about your scenario, the definition of the
RadOutlookBar and the
RadControls version you use, we will further investigate the causes for the exception.
In the meantime I attached a sample solution where I edited the default
RadOutlookBarItem ControlTemplate to set a
BorderThickness of 0 to the selected visual state elements as well as change the
ControlItem_Background_Selected brush to
Transparent. Please have a look at the solution and let me know if it helps.
All the best,
Tina Stancheva
the Telerik team
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