taka a look in Marcia answer, that is the easiest way. But If You want to show all Memo fields from the cursor, the editbox in the grid would be better. Then as in after RowColChange event on the grid:

 LPARAMETERS nColIndex
 DO CASE
    CASE nColIndex == (Index of the column with the Memo) .AND. this.RowHeight # (desired row height)
         this.RowHeight = (desired row height)
    CASE nColIndex # (Index of the column with the Memo) .AND. this.RowHeight == (desired row height)
         this.RowHeight = (initial row height)
 ENDCASE

In that way when You enter the column with memo the rowHeght will be expanded and after leaving will be reset to initial value