.NET里ListView(C++)中,如何让滚动条一直显示?

ListView::Scrollable 设置为true时,当没有足够空间来显示所有项时,显示滚动条,但现在要求
无论显示多少内容,滚动条都能显示

ListView it = new ListView();
ScrollViewer.SetVerticalScrollBarVisibility(it, ScrollBarVisibility.Visible);
ScrollViewer.SetHorizontalScrollBarVisibility(it, ScrollBarVisibility.Visible);