'宣言 Protected Overrides Sub SetItem( _ ByVal index As System.Integer, _ ByVal item As T _ )
'宣言
Protected Overrides Sub SetItem( _ ByVal index As System.Integer, _ ByVal item As T _ )
protected override void SetItem( System.int index, T item )
DependencyObjectCollection<T> クラス DependencyObjectCollection<T> メンバ