'宣言 Public Event DropDownOpenChanging As System.EventHandler(Of DropDownOpenChangingEventArgs)
'宣言
Public Event DropDownOpenChanging As System.EventHandler(Of DropDownOpenChangingEventArgs)
public event System.EventHandler<DropDownOpenChangingEventArgs> DropDownOpenChanging
C1DropDown クラス C1DropDown メンバ