Row count for a datawindow group header

Hi All,

I couldn't find a good way to do this yet. I hope one of you has an idea. I need to know in run-time, the row number of the group header. This is so our usual rows color alternating Scheme keeps Consistent. We currently alternate to a light blue color every other row using the following line in the Background Color Expression of the Detail Band:

If( Mod( GetRow( ), 2 ) = 0, RGB(224, 250, 254 ), RGB( 255, 255, 255 ) ). It provides for the following effect (see below effect1).

When trying to use the same Expression on the Header band it doesn't Alternate nicely because the rows are not counting the same and the Expression looks at the Detail rows and not the Header row (see below Effect2)

Any ideas on how to count Header rows?

Thanks in advance.

Shai