code: function(){
  			var contextMenu, menuItems, t=this; 
  			contextMenu = DOM.get('menu_' + t.id);
  			menuItems = DOM.select('a[role=option]', 'menu_' + t.id);
  			menuItems.splice(0,0,contextMenu);
  			t.keyboardNav = new tinymce.ui.KeyboardNavigation({
  				root: 'menu_' + t.id,
  				items: menuItems,
  				onCancel: function() {
  					t.hideMenu();
  				},
  				enableUpDown: true
  			});
  			contextMenu.focus();
  		}
docs: Internal functions