Adding a column for a a RadGridView past the 10th collumn result in malfunction

Adding a button collumn to the grid that passes the 10th collumn with this method the 11th overlaped the 10th a a 11th is created empty

Any ideias

            GridViewCommandColumn commandColumnV5 = new GridViewCommandColumn();
            commandColumnV3.Name = "CommandVer5";
            commandColumnV3.UseDefaultText = true;
            commandColumnV3.DefaultText = "Rejeita";
            commandColumnV3.HeaderText = "Regeita";
            commandColumnV3.Width = 20;

            grdDocumentos.MasterTemplate.Columns.Add(commandColumnV5);