The desired functionality could be implemented using jQuery. You can subscribe for the blur event of the control and get all its parents. Thus, you can check for each one of them, if their ID contains "PageView". f course, for that purpose you need to set similar IDs for the PageViews, associated with the RadTabs (e.g. "RadPageView_Home").
In addition, in order to get the active tab, you can use the Client API of the RadTabStrip and the get_selectedTab()
method on the RadTabStrip object.
In the attachment you can fond a simple example, which demonstrates the above suggested approach
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