cfchart thickness variation

Hi. Is there any way of varying the chart thickness ? I am using a cluster horizontal bar. What I want is for me to be able to change the thickness of a bar. Example, if there are 3 bars clustered, I want the first one to be thicker than the next two. Or maybe I want the 2nd bar to be thicker than the first and third. Any idea? Thanks.

a sample image of chart I want: please click on sample chart