export even drill down sections

[skitty123]

I have created a report which has 3 levels or grouping.

when you see the report only the first level of group by is visible, rest are hidden untill you drill down.

My code for exporting works fine but when I export to a different file format ( excel/ pdf etc) it only exports the report as you first see it ( with drill down sections hidden.)
how do I make the drill down sections visible rt before export and hide them again?

thanks!