Infragistics WebTab control is very versatile and offers rich server- and client-side model. Among client-side events are

• SelectedIndexChanged – fires after user has changed the tab to provide ways to interact with newly selected tab
• SelectedIndexChanging – fires before user has changed the tab to provide ways to interact with currently selected tab and to give user a chance to cancel change.

Both work fine if user manually changes tabs by clicking on tab headers, but call to client-side set_selectedIndex() function (which changes tabs programmaticaly) only fires SelectedIndexChanged, skipping SelectedIndexChanging altogether. But there’s a way to make it work.
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