In order to remove the "arrow" you need to edit the ControlTemplate of the RadPanelBarItem. More information on how to edit ControlTemplates you can find here.
Then you can set the Visisbility of the "arrow" element to Collapsed like in the attached example.
i hope this info helps. Let me know if you need more.
Regards,
Tina Stancheva
the Telerik team
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I tried using the example you posted and it works, but it doesn't work when I specify the panel bar items in my xaml file instead of loading them from code behind. Why is this?