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In order to set a tab as the active RadRibbonBar tab, you should set its IsSelected
property to true:
|tabItem3.IsSelected = true;
Please note that Microsoft suggests in the Office 2007UI Design Guidelines that:
"Displaying Tabs section: The leftmost tab MUST be selected every time the application is started". So, if you want to be compliant with these guidelines, you should always have the first tab initially selected.
Hope this helps. If you have additional questions, feel free to contact me.
All the best,
the Telerik team
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