a workaround for you:

- define a Image subclass into a VCX
- add to it :

1. _ControlSource property  && set it to ''
2. BackStyle_Access method
3. Fill BackStyle_Access with this code
* BackStyle_Access 
this.PictureVal = EVALUATE(m.this._ControlSource)
RETURN m.THIS.BackStyle

4. Add this image class to your Grid column
5. set this Grid Column : Bound = .F. and Sparse = .F.
6. Fill Image _controlSource = 'gridTable.ImageFieldName'
7. Run: -> you see rows image

Fabio