Help with Bar charts

Hello I am new in Qt, I'm using QtCreator in Ubuntu 9.10.
I need a little advice on a job I'm doing with Qwt widgets. I'm using a few examples of Qwt, the first is a bar chart and always that I wanted to have a new range of values the bars for these values should appear to the side and not on top of each other, as it is now. The other issue is also on a chart but in this case, the phasors. I want to draw six phasors (voltage and current) through the amplitude and angle. Phasors that are drawn, are made in the Gimp as an example.
Someone can give me advice on how to do this?
Both charts are attached for better viewing.