>Any ideas anyone?

If you wish that dynamic win respect Highlight, set Sparse = .F.

   WITH THIS.grid1
      THISFORM.HIGHLIGHTBACKCOLOR = .HIGHLIGHTBACKCOLOR
      THISFORM.HIGHLIGHTSTYLE     = .HIGHLIGHTSTYLE
      THISFORM.gridbackcolor      = .BACKCOLOR
      THISFORM.gridforecolor      = .FORECOLOR

     *****  AAAAADDDDDDDDEEEEDDDDDD ********
      .columns[2].Sparse = .F.
   ENDWITH

Remember:
every CurrentControl.BackColor set in AfterRCC is annulled by the following cycle of paint.