如果没有滚动视图，我如何禁用项目。
StackLayoutContent -> StackLayout(3button) (Position Start)
StackLayoutContent -> StackLayout -> ScrollView->StackLayout(25 button) (Postition Centar)
StackLayoutContent ->StackLayout(2button) (PositionEnd)
问题是scrollView中的按钮超出其他堆栈怎么禁用？