bar height in stacked bar charts gxt-3.0.0-beta1

Hi guys, how do I set a bar height? I was able to edit it on firebug.

For now I have the left graph but I need it smaller as the right one.

http://imageshack.us/photo/my-images...dbarchart.jpg/http://img6.imageshack.us/img6/9684/...archart.th.jpg

The height is computed from the chart size and the number of bars, including gutters and padding.
So if you add more bars, they will be smaller. Likewise, to get thinner bars, just reduce the height of the chart.
Or increase the gutter size with the setGutter() method of the BarSeries class.

thanks,

problem solved.