I have a grid which is set to 100% height. The grid displays search results. When a user clicks on the "find" button, the results are loaded in the grid. In IE (9), the grid appears correctly. In Firefox (15), there is a vertical space of about 125px below the grid pager and the grid doesn't extend all the way down to the bottom of its container. If the user clicks on "search" a second time, the grid extends properly. I have attached two screen captures demonstrating what it looks like in ie (correct) and firefox (incorrect). I have added a panel with colored background as a container for the grid so you can see it appears to be the grid which is not extending and not the container. This effect occurs even if I do not include this panel. My markup is below.