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setsensible(datefrom,dateto) with grid (Urgent)

i need to add setsensible to the grid for the second calendar column ('ed,calendar,calendar)
to not let the user choose a date less then datefrom
thank you

can be done as

grid.attachEvent("onEditCell",function(stage, id ,ind){
  if (stage == 1){ //occurs when edit operation started and calendar rendered
  if (ind == FROM_INDEX) grid._grid_calendarA.setSensitive(null, grid.cells(id,TO_INDEX).getValue());
  if (ind == TO_INDEX) grid._grid_calendarA.setSensitive(grid.cells(id,FROM_INDEX).getValue(),null);
  }

  return true;
})