Header filter value retainiing

Hi,
I am using dhtmlxGrid v.2.1 Professional edition build. If i use the function getFilterElement , i am getting error as getFilterElement not a function. what should i do to fix the issue?
Another thing, without loosing header filter values, can i refresh the grid data?

Please reply.

Unfortunately the only solution in your case is to update the version of your dhtmlxGrid.