As we were working on one of our projects, we had the need of creating multiple combo charts. The problem was that we could not change the colors to match our mashup/webpage. So, I decided to make an extension, that gives full control of the chart appearance and it's labels. The same as my Barchart extension this is wrapping text labels underneath the bars. If you still have problems with the text, then just increase the width of the bars and everything should be back in place.