>Do you mean Formset Class? I have tried to create my own Formset class (form+toolbar) and it's working,thanks a lot. Besides, is there any way to "stick" a toolbar in a form? The toolbar is always at the top of the form regardless the size of the form or the ShowWindow property.

No, I mean you create Form class (not .scx Form) and make instance of it.
Not DO FORM, but oForm = CREATEOBJECT("oSomeFormClass").