Could you explain how a cell can be "referenced" ?

If the cell has focus, from any method within the control, you can refer to it as This.

If you are trying to determine this in a method outside the grid, the grid still has to have focus for this code to work:

loGrid = Thisform.grdWhatever
FOR EACH loColumn IN loGrid.Columns
  IF loActiveControl.ActiveColumn = loColumn.ColumnOrder
    loControl = EVAL( 'loColumn.'+ loColumn.CurrentControl )
    EXIT
  ENDIF
ENDFOR

Perhaps we would be in a better position to help you here if we know what it was you were trying to do.