how to create alternate color columns in MS SQL reporting services (rdl)

I found something related to row coloring at ::
http://weblogs.sqlteam.com/joew/archive/2008/08/20/60691.aspx

i went through all the properties for column but none that would help me achive me goal.

SO in my case .. the no of rows are fixed .. but columns vary .. so i wnat the alternate columns to be of different color (say white and silver)