Hi C Bates,
You can use the Loaded event of the RadTabControl. Basically, after the currently selected tab (by default it is the first one initially) is loaded, first the Loaded event of the tabControl is fired, then the Loaded event of the current tab is fired. Then on every selection change (no matter whether you select a previously selected tabitem or not) only the Loaded event of the TabItem fires.
.tabControl.ItemsSource = Enumerable.Range(0, 1000).Select(x =>
sender, RoutedEventArgs e)
Let us know if this fits in your scenario.
All the best,
the Telerik team
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