In what event of the Grid?

do case
   case nKeyCode =  5 && UP ARROW      
      select tbl
      do while !bof() and ac_level != '3'
         skip -1
      enddo
      this.AfterRowColChange()
*      nodefault
   case nKeyCode =  24 && DOWN ARROW
      select tbl
      do while !eof() and ac_level != '3'
         skip 1
      enddo
      this.AfterRowColChange()
*      nodefault
endcase

It works fine, but it skips 1 record further.
AC_LEVEL
1
2
3
3
if the pointer is on record 1 which is AC_LEVEL = 1 if i press DownArrow it moves to AC_LEVEL = 3 but record 4.
Any help on this.