RadTabStrip for ASP.NET AJAX Version Q3 2008 released 11/25/2008 (release history)

With RadTabStrip it is easy to add, remove or disable tabs at the client side. What is more, you can persist the changes after postback. 

<script type="text/javascript">
    function addTab()
    {   
        ...
        //Adds the tab to the Tabs Collection of the selected tab
        selectedTab.get_tabs().add(tab);
        tab.set_text("Child Tab " + selectedTab.get_tabs().get_count());
        ...        
    }
    
    function removeTab()
    {
        ...        
        //Removes the selected tab from the Tabs Collection of the tabstrip
        tabStrip.get_tabs().remove(selectedTab);        
        
    }
    
    function disableTab()
    {
        ...
        //Disables the selected tab
        selectedTab.set_enabled(false);
                    
    }
</script>

If you want to persist these changes after postback, the methods described below should be used:

• tabStrip.trackChanges();  -indicates that client-side changes are going to be made and these changes are supposed to be persisted after postback.
• tabStrip.commitChanges(); - submits the changes to the server.
  

var tabStrip = $find("<%=RadTabStrip1.ClientID%>");
tabStrip.trackChanges();
//add, remove, disable tabs
tabStrip.commitChanges(); 

Client side changes are available on the server side after postback. You can use the ClientChanges property to access them:

foreach (ClientOperation<RadTab> operation in RadTabStrip1.ClientChanges)
{
	RadTab tab = operation.Item;

	switch (operation.Type)
	{
		case ClientOperationType.Insert:
			break;
		case ClientOperationType.Remove:
			break;
		case ClientOperationType.Update:
			UpdateClientOperation<RadTab> update = operation as UpdateClientOperation<RadTab>;
			break;
		case ClientOperationType.Clear:
			break;
	}	
}