Hi,
The column header of the grid appears to be missing a pixel or two in height, at least when used in the FireFox browser. Have a look at this fiddle:
http://jsfiddle.net/_stephan_/wNEAr/3/
What I observe inFireFox when looking at the fiddle result is that the letter ‘g’ in the column header for the first column is incomplete. Its missing something like 2 pixels at the bottom and thus I do not see the full ‘g’.
I tested the fiddle in Internet Explorer 10.0 and its looks just fine. the ‘g’ is shown correctly and completely. My OS is Windows 7 and my FireFox is updated to the most recent version.
Regards,
Stephan