Android Question on click submenu item in NavDrawer

I am trying to add on click submenu items in navdrawer with example "navigationView" I am using this command
NavDrawer.NavigationView.Menu.AddWithGroup2(1, 1, 1, "Home", xml.GetDrawable("ic_home_black_24dp")).ItemCollapsed=True
NavDrawer.NavigationView.Menu.AddSubMenu(1,2,1,"new")
but only main menus are appeared .I don't Know how to add onclick submenu. ANyone who has tried successfully then plz share your experience

Regards