How to make a UniformGrid scrollable?

hi,

In my Silverlight player, I programmatically generate a fluctuating number of buttons and put them into a UniformGrid, it works fine. But the out-most container, say, a Grid, is size-limited. Buttons will be squeezed if there are too many of them need to be fit in.

So I wrap a ScrollViewer outside of the UniformGrid, planning to make the UniformGrid scrollable if necessary. But it seems not working, buttons are still squeezed together.

Any one knows how to do it?  thanks!

Peter