How to make the Header and footer of the grid fixed in the Web Portal?

I would like to display the unmanaged AD accounts data in the Web Portal. So I have created Database object collection for ADSAccount table and created grid band under grid for the same. Then I am displaying 3 columns (one custom column for check box, SAMAccountname and Account Owner fields)

Headers - Column1(no name for check box), Column2 (SAMAccount Name) Column3 (Account Owner)

Footer - The pagination data 

how to fix the Headers and Footer and enable the scroll option only for Grid items??