Resize Report Column Width when Hidden

I have a report that has a certain number of columns that are hidden and when hidden they leave a lot of white space. Is there a way to detect when they are hidden and set the width property to 0 and then reverse the value when they are visible?I used a list box with embedded list boxes to control the column widths automatically. Now the problem is that If I give column headers in the list they do not shrink and I don't want the data repeated above each group either. Any ideas?sql