如何添加右键菜单

如下;

   

var contextMenu:ContextMenu=new ContextMenu();
    var contextMenuItem:ContextMenuItem=new ContextMenuItem("full screen");
    var contextMenuItem2:ContextMenuItem=new ContextMenuItem("To withdraw from full-screen");
    contextMenuItem.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, menuItemSelect);
    contextMenuItem2.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, menuItemSelect);
    contextMenu.customItems.push(contextMenuItem);
    contextMenu.customItems.push(contextMenuItem2);
    this.contextMenu=contextMenu;