GridView: Change back color Checkbox by default in grid

 private void RadGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
 {
    var cell= e.CellElement as GridCheckBoxCellElement;
     if (cell != null)
     {
         RadCheckBoxEditorElement editor = (cell.Editor as RadCheckBoxEditor).EditorElement as RadCheckBoxEditorElement;
         RadCheckmark checkmark = editor.Children[0] as RadCheckmark;
         checkmark.Fill.BackColor = Color.White;
     }
 }