find radiobuttonlist control in gridview

Question

hi,
 
  My problem is I have a radiobuttonlist in my gridview. after firing the gridview  
  rowediting event i am unable to see my radiobuttonlist
 
I tried like this,

   RadioButtonList rbl = editingRow.FindControl("rblist11") as RadioButtonList;
        rbl.Visible = true;

 and also like this,

  RadioButtonList rbl = (RadioButtonList)GridView1.Rows[e.NewEditIndex].Cells[3].FindControl("rblist11");
        rbl.Visible = true;

I coldn't resolve my problem.

please help me..