The currently selected RadTabItem could be accessed by the RadTabControl.SelectedItem property.
The content of the selected item could be get/set like so:
(radTabControl.SelectedItem as RadTabItem).Content
You can navigate the RadTabItems by using the SelectedIndex property of the RadTabControl.
Please let us know if this info helps you. If it doesn`t feel free to ask and we would be glad to assist you.
the Telerik team
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