Horizontal scrollbars at end of data

Dear All

I have an iframe of a certain height. The height of the iframe is
a lot bigger than the grid. What I have noticed is that the
horizontal scrollbar does hang at the end of the iframe not
where the data in the grid ends. How do I make the scrollbar
stick (so to speak) with the grid?

PS: Nice grid btw, Alex.

What do you have the height of your grid set to?