DevExpress XtraTabControl选项卡关闭方法

public MainForm()        {            InitializeComponent();            this.tabControl.CloseButtonClick += new EventHandler(tabControl_CloseButtonClick);        }        void tabControl_CloseButtonClick(object sender, EventArgs e)        {            ClosePageButtonEventArgs arg = e as ClosePageButtonEventArgs;            (arg.Page as XtraTabPage).PageVisible = false;          }