To find any control which resides on footer on the datagrid,the following lines of code..solve the problem..
DropDownList ddlS=(DropDownList) DG1.Controls[0].Controls[DG1.Controls[0].Controls.Count-1].FindControl("DDLCountries");
this is to find dropdown list in the datagrid.....
the same you can make it to find any control in the footer.
Regards,
Moustafa arafa