charts category lable by programming

Hi,

I have created some cool dashboards with a feature to let the user create custom charts. Great did it all by programming but have an issue.

If I generate charts with negative values the the bar chart creates negative values. the bars flow over the period discribtion on the x as of the chart. This make reading the period a bit difficult.
The tekst would be better readeble if I could let the user make the tekst bold or a bit bigger

Is it possible to change the font of the categorie by programming?

I cannot find a gr function for that

regards
Allard