dbgrideh 中checkbox列，灰色状态时处理从未选中状态

查看ehgrid源码

procedure TCustomDBGridEh.DefaultDrawColumnCell(const Rect: TRect;
  DataCol: Integer; Column: TColumnEh; State: TGridDrawState);

    .......

    //modify by mofen
    if CheckBoxGrayAsUnChecked and (Column.CheckboxState = cbGrayed) then
    begin

      //如果是灰色状态
      PaintButtonControl {Eh}(Canvas.Handle, ARect1, Canvas.Brush.Color, bcsCheckboxEh,
        0, Flat, False, True, cbUnchecked
        );
    end else
    begin
      //DrawCheck(Canvas.Handle,ARect1,Column.CheckboxState,True,Flat);
      PaintButtonControl {Eh}(Canvas.Handle, ARect1, Canvas.Brush.Color, bcsCheckboxEh,
        0, Flat, False, True, Column.CheckboxState
        );
    end;