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I’m trying to use best row fit for images and it is not working.
I assume I have not turned on a style or something.
Code following:

bool bRedraw = false;

    //m_pDataProvider = NULL;
    OuterRowCountTopSet( 1L, bRedraw );
    OuterColumnCountLeftSet( 1L, bRedraw );
    OuterColumnCountRightSet( 1L, bRedraw );
    OuterColumnWidthSet( true, 0L, 14 );
    OuterColumnWidthSet( false, 0L, 14 );

    NoHideSelectionSet( true, bRedraw );
    SubtractSelectionAreasSet( true, bRedraw );
    LbExtSelectionSet( true );
    GridLinesHorzSet( true, bRedraw );
    GridLinesVertSet( true, bRedraw );
    HoverEventsSet( true, true );
    MultiAreaSelectionSet( true );
    HoverHighlightSet( true, false, false, false, true, true );

    BseModifyStyleEx(__EGBS_DYNAMIC_RESIZING|__EGBS_RESIZING_CELLS_INNER, __EGBS_FIXED_SIZE_ROWS);

    //clear the grid
    ClearGrid();

    //insert the columns
    ColumnAdd(2);

    //add the data
    pHeaderData =
        STATIC_DOWNCAST(
            CExtGridCellHeader,
            GridCellGetOuterAtTop(
                0,
                0L,
                RUNTIME_CLASS(CExtGridCellHeader)
                )
            );
    pHeaderData->TextSet( "Data" );
    pHeaderData->ExtentPercentSet(50);
    pHeaderData->ExtentSet(200);

    //add the value
    pHeaderValue =
        STATIC_DOWNCAST(
            CExtGridCellHeader,
            GridCellGetOuterAtTop(
                1,
                0L,
                RUNTIME_CLASS(CExtGridCellHeader)
                )
            );
    pHeaderValue->TextSet( "Value" );
    pHeaderValue->ExtentPercentSet(50);
    pHeaderValue->ExtentSet(200);

    ////insert the rows
    RowAdd(1);

    CExtBitmap bitmap;
    bitmap.LoadBMP_File("res\\Acropolis.bmp", true);
    bitmap.AlphaColor(RGB(0,128,128), RGB(0,0,0), 0);
        CExtGridCellPicture * pCellDesc =
            STATIC_DOWNCAST(
                CExtGridCellPicture,
                GridCellGet(
                    0L,
                    0,
                    0,
                    0,
                    RUNTIME_CLASS(CExtGridCellPicture)
                    )
                );
        pCellDesc->BitmapSet(&bitmap);
        this->BestFitRow(0);

You can send it to support@prof-uis.com.

I’ve met this problem not so long ago. It turned out that the problem is caused by the fact that each row has a maximum height set by default, and this max height is a regular single line. So the solution was that I had to call ExtentSet(200, 1); for each row header when initializing. The value 200 is just a made-up value, I guess it could work with any other big enough value.

That did not work. I tried setting it on all rows and columns including the header

Ok, just to make sure I understood you: Did you try this code?

pHeaderValue =
        STATIC_DOWNCAST(
            CExtGridCellHeader,
            GridCellGetOuterAtLeft(
                0,
                0L,
                RUNTIME_CLASS(CExtGridCellHeader)
                )
            );
pHeaderValue->ExtentSet(200, 1);
 
pHeaderValue =
        STATIC_DOWNCAST(
            CExtGridCellHeader,
            GridCellGetOuterAtRight(
                0,
                0L,
                RUNTIME_CLASS(CExtGridCellHeader)
                )
            );
pHeaderValue->ExtentSet(200, 1);

I think (not definitely sure though) that in your case your need to set both left and right header cells, as these cells store the extent of the row.

To simplify I just set it to one column and still had the problem even making the call of pHeaderValue->ExtentSet(200, 1)

I made a sample app, only a dialog with one single grid on it. In its OnInitDialog I placed your code (just needed to add the grid variable for the grid-calls), together with my proposed addition. The bmp I used was 32x32 in size. The row height was adjusted properly. Please check your code to this one:

    // your code above, all the same till RowAdd call
    ////insert the rows
    m_wndGrid.RowAdd(1);

	pHeaderValue =
        STATIC_DOWNCAST(
            CExtGridCellHeader,
            m_wndGrid.GridCellGetOuterAtLeft(
                0,
                0L,
                RUNTIME_CLASS(CExtGridCellHeader)
                )
            );
	pHeaderValue->ExtentSet(200, 1);
 
    CExtBitmap bitmap;
    bitmap.LoadBMP_File(_T("res\\tools.bmp"), true);
    bitmap.AlphaColor(RGB(0,128,128), RGB(0,0,0), 0);
        CExtGridCellPicture * pCellDesc =
            STATIC_DOWNCAST(
                CExtGridCellPicture,
                m_wndGrid.GridCellGet(
                    0L,
                    0,
                    0,
                    0,
                    RUNTIME_CLASS(CExtGridCellPicture)
                    )
                );
        pCellDesc->BitmapSet(&bitmap);
        m_wndGrid.BestFitRow(0);

Can I post my code somewhere to have it looked at?