scrollbar and datagrid problem

In my datagrid I have in the rowdetailsTemplate a stackpanel that has in it anther datagrid. when I open a row that has in it a datagrid with about 20 rows and I try scrolling with the scrollbar (of the main grid) using the bottom arrow it wouldn't开发者_开发知识库 scroll down.

For have scroll panel you need <ScrollViewer> component as show in this post :Scrolling In Silverlight Panels

It's possible add this component inside your grid.