collapsiblePanelExtender Using Menu Dynamically

Question

Hey Everybody,

           We make menu using collapsiblePanelExtender Run the form Menu header Showing but submenu not showing 

The error was above Mensioned 

Uncaught Sys.ArgumentException: Sys.ArgumentException: Failed to find element "ContentPlaceHolder2_Login_UserInfo_Pnl1#1" Parameter name: CollapseControlID