ScrollView in stack layout overriding the another layout in android

Hi,
I have a page having vertical stack layout as main layout and stackLayout1,scrollview,stackLayout2 as children. When I scroll up the scrollview its not scrolling in the area allocated to it but its overlapping the stackLayout1 which is above to it.This problem is only with android not in iOS. Is there any solution for this problem.If so please suggest me.

Thanks,
sunil