Deleting tab in Client side Error

[kian]

Hi
I'm using below function for deleting a tab from a radtabstrip in client side.

function deleteTab(tabText)
   {
       var tabStrip = $find("<%= RadTabID.ClientID %>");
       var multiPage = $find("<%= MultiPgID.ClientID %>");

       var tab = tabStrip.findTabByText(tabText);
       var pageView = tab.get_pageView();
                
       var tabToSelect = tab.get_nextTab();
       if (!tabToSelect)
           tabToSelect = tab.get_previousTab();
                
       tabStrip.trackChanges();
       tabStrip.get_tabs().remove(tab);
       tabStrip.commitChanges();
                
       multiPage.trackChanges();
       multiPage.get_pageViews().remove(pageView);
       multiPage.commitChanges();
                
       if (tabToSelect)
           tabToSelect.set_selected(true);
   }

By using this function, tab is deleted in client side but when I want to add a deleted tab again to the tabstrip in server side, I encounter with this error:

Two components with the same id 'MyUserControl_userControl_RadNumericTextBox1' can't be added to the application.

I think this tab is deleted in client side but exists in server side. because for example when I use server side event like button click that raise post back, deleting process happens correctly.
Tanx