I solve it. However i give you the solution that I get ( for helping someone else or to give to me a better solution :) ). I used the ColumnManagerRow. Below is the code :
C#
ColumnManagerRow
managerRow = new ColumnManagerRow();
managerRow.BackColor =
Color.Transparent;
this.gridControl1.FixedHeaderRows.Remove(this.gridControl1.FixedHeaderRows[1]);
gridControl1.FixedHeaderRows.Add(managerRow);
