null value of types Integer and Float accepted by a grid
I have a grid with fields of types Float and Integer ( in Java) because i need to put null value in these fields, but when i add new record to this grid with null value of some fields, the new record is saved in the database but i cannot see it in the grid. I think the problem is that fields in grid don't accept null value of types Float and Integer ( not int and float).Anybody can give me any suggestion???
Thanks in advance,