Thanks for writing and for your questions.
You can change the size of the tabs in RadRibbonBar using the following code snippet:
I want to mention that the size of the tabs in RadRibbonBar is calculated according to strict rules which are described in MS Office 2007 UI Design Guidelines. In other words, generally you should not set a custom size to the tabs in RadRibbonBar.
I hope this is helpful.
All the best,
the Telerik team
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