public delegate void BeforeRibbonGroupDropDownEventHandler( object sender, BeforeRibbonGroupDropDownEventArgs e )
'宣言 Public Delegate Sub BeforeRibbonGroupDropDownEventHandler( _ ByVal sender As Object, _ ByVal e As BeforeRibbonGroupDropDownEventArgs _ )
BeforeRibbonGroupDropDownEventHandler メンバ Infragistics.Win.UltraWinToolbars 名前空間