'宣言 Protected Overrides Function AfterMouseDownTab( _ ByVal element As Infragistics.Win.UIElement, _ ByVal tab As Infragistics.Win.UltraWinTabs.ITabItem, _ ByVal e As MouseEventArgs _ ) As Boolean
protected override bool AfterMouseDownTab( Infragistics.Win.UIElement element, Infragistics.Win.UltraWinTabs.ITabItem tab, MouseEventArgs e )