Radio Button on Driver Program

Hi Experts,

I am working on smartforms.

In that my printprogram contains 2 radio buttons like

 1) Header
 2) Items

If I select Header Radio button in selection screen , I want to display header related data in "Main window" and if I press Items Radio button in selection screen, I want to display Item Related data in the same "Main window".

Can anybody help me in this issue,

Thanks in Advance........

Regards

Ganesh Reddy