I tried to make form
tall enough but nothing!
What do you mean by "nothing"? What do you see?
You may need to open the Form in design mode; move all of the controls
(textboxes, combos, and so on) up to the top of the Detail section;
and drag the bottom of the Detail section snug to the bottom of the
controls. This block of controls should repeat as many times as there
is room for them in the Subform control on your mainform.
John W. Vinson[MVP]