Proper fill for grid panel empty space beneath last row

ExtJS v4.1.1a

I have a grid panel.
It displays a fixed number of items (though their height is somewhat variable).
The grid panel has a fixed height (tall enough that all items display...regardless of their height, with no scroll bar).
I'm using a row numbering column (first).

The problem is that there is a variable amount of white space between the bottom of the listed items and the page control.

Is there a reasonably simple way to get a cross browser friendly fill for the empty space that just looks like an empty row (first cell with the shading for a row numbering column etc.)?

A bodyCls doesn't seem to work...the row numbering fill is different depending on the browser (gradient for recent browsers, but solid for older ones).

I'm looking for suggestions to try.

Thanks.

-Chris

You can change the css of the body background. Have you thought of letting it auto height?

I am currently taking the approach of chaning the background css...I have a hoop to jump through due to rendering for older browsers, but it's an "OK" solution.

I've got a paging tool bar docked at the bottom, and we don't want it contantly moving around, so shrinking the control isn't really an option here.

Thanks.

-Chris