We have implemented telerik TABs Load On Demand method. We have added RadTabStrip in main usercontrol ( TopTab.ascx ). For each pageview of tab strip, we have added separate usercontrols and set RadAjaxManager property EnabledAjax="true"
Below is our page structure
Master Page > Client.aspx > TopTab.ascx ( user control ) > RadTabStrip ( RadTabStrip contains multiple tabs)
Out Of these multiple tabs we have sub tabs in 2 Tabs. For each of these sub tabs including main tabs, we have usercontrols.