Trigger Datasources based on Selector(Combox )

Hi,

I have requirement need to Trigger Datasources based on Selector(Combox having:13 days,YTD,13 Weeks).

I have created 3 Data Sources which is for 13 days,YTD,13 Weeks

I need to trigger 13 days when I select 13 days from combobox,similarly if I select 13 weeks need to trigger 13 Weeks Datasource,etc..

Please help me.

Thanks,

Prasad