'宣言 Public Delegate Sub UltraWebToolbar.VisibleChangingEventHandler( _ ByVal sender As Object, _ ByVal vce As VisibleChangingEvent _ )
public delegate void UltraWebToolbar.VisibleChangingEventHandler( object sender, VisibleChangingEvent vce )
このイベントはキャンセルできます。
VisibleChangingEvent