Problem not rendering the chart

Hello

i'm using jcharts inside a very simple swing application (only a jpanel)

i want to display a clustered-bar chart.

I posted the code i wrote here:
http://veleno.pastebin.com/302366

The problem is that the chart is not rendered properly (by default, th 
window is empty) and only when i try to resize the window, i can see it, 
but it disappear again if i resize it again (and when i say "resize" i'm 
saying in a "random-moving-fashion, that's to say that if i resize it 
the same way twice, i possibly don't get the chart rendered).

Any idea?
I'm using latest 0.7.x (0.7.5), and java 1.5, linux.

Thanks
Valerio



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