Hello Timothy J,
To achieve this behavior, you could remove the desired RadTabItem element from the Items collection of the RadTabbedWindow control as follows:
To achieve this requirement in a data-binding scenario, you could remove the desired item from the collection that is bound to the ItemsSource property of the control.
With this being said, I hope the provided information will be of help to you.
Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.