Conditionnal subreport viewing

estebi

Another question for high-skilled Birt designers ! And a new challenge...

Here what I want to do :
I have a report with 3 possibilities depending on the parameters entered. Because I want to avoid overloading the report and increase loading time, I have dispatched my charts in subreports.
What I want to do is having an empty main report that could read the parameters and decide which subreport should be shown.
How can I do this programmatically ?

Thank you !