how to make 2 selection fields in one row

hi experts,

Iam new to webdynpro abap. I have doubt in webdynpro abap.I am creating selection screen in webdynpro abap.In this screen i am having 4 selection screen fields.but my reqirement is first two selection screen fields would be in first row.how to achieve this reqirement.plz let me know the solution.

Thanks&Regards

ananth.