I was wondering if it is possible to move the cursor on the grid to the next record other than a command like
SELECT RecordSourceTable
SKIP

Create a custom method on your grid class called Move2NextRow(). Call it whenever you want to move to the next row (provided the grid has focus when you do):

LOCAL lnMaxRows
WITH This
  *** Calculate the maximum number of rows in the grid
  lnMaxRows = INT( ( .Height - .HeaderHeight - IIF( INLIST( .ScrollBars, 1, 3 ), SYSMETRIC( 8 ), 0 ) ) / .RowHeight )
  *** If we are sitting on the bottom row in the visible portion of the grid,
  *** Scroll the grid down a row in case there is a next record			 
  IF .RelativeRow >= lnMaxRows
    .DoScroll( 1 )
  ENDIF   
  .ActivateCell( .RelativeRow + 1, .ActiveColumn )
ENDWITH