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Good Day,

I want to get more info how to implemant a grid cell containing check box, how to handle click event on the check box and how to get its status ??

Many Thanks for your support !!!

In fact, there is a more simple way to realize this function without override OnGridCellInputComplete.

void CMyView::OnButtonApply()
{
    ......
    CExtGridCellCheckBox* pCellCheckBox;
    LONG nRowNo = 0;
INT nStatus = 0;
    ......
    for( ... )
    {
        pCellCheckBox =
        STATIC_DOWNCAST(
            CExtGridCellCheckBox,
            m_wndGrid.GridCellGet(
                    0L,
                    nRowNo,
                    0,
                    0,
                    RUNTIME_CLASS(CExtGridCellCheckBox)
                    )
                );
        nStatus = (pCellCheckBox->GetCheck()) ? 1 : 0;
    
        nRowNo++;
    }

    ......

    return;
}

In the corresponding .h file, define m_wndGrid:
CMyGridWnd m_wndGrid;

CMyGridWnd is a class derived from CExtGridWnd.

Simply use the CExtGridCellCheckBox class for any cell that looks like the check box:

CExtGridWnd * pWndGrid = . . .
LONG nColumnNo = . . .
LONG nRowNo = . . .
CExtGridCellCheckBox * pCheckBoxCell =
        DYNAMIC_DOWNCAST(
            CExtGridCellCheckBox,
            pWndGrid->GridCellGet(
                nColumnNo,
                nRowNo,
                0,
                0,
                RUNTIME_CLASS( CExtGridCellCheckBox )
                )
            );
    pCheckBoxCell->Set3StateMode( true OR false );
        pCheckBoxCell->SetCheck( 0 OR 1 OR 2 );

This code creates a check box cell inside the grid window. You can handle when the check state changes by using a CExtGridWnd-derived class which implements the OnGridCellInputComplete() virtual method:

void CYourGrid::OnGridCellInputComplete(
    CExtGridCell & _cell,
    LONG nColNo,
    LONG nRowNo,
    INT nColType,
    INT nRowType,
    HWND hWndInputControl
    )
{
    ASSERT_VALID( this );
    ASSERT_VALID( (&_cell) );
    CExtGridWnd::OnGridCellInputComplete(
        _cell,
        nColNo,
        nRowNo,
        nColType,
        nRowType,
        hWndInputControl
        );
    if( nColType != 0 || nRowType != 0 )
        return; // the cell is editable header cell - not data cell
CExtGridCellCheckBox * pCheckBoxCell =
        DYNAMIC_DOWNCAST(
            CExtGridCellCheckBox,
            &_cell
            );
    if( pCheckBoxCell == NULL )
        return; // edited cell is not a check box cell
    INT nCheck = pCheckBoxCell->GetCheck();
    . . .
}

Many Thanks for your reply !!