I see 2 solutions for you there, the first one is to put the generted form in a scrolled window, which is the easiest solution but the result will not be very good looking.
For the second solution, libgnomedb allows you to specifiy a custom layout for your form (you can then use tabs or several columns to organize your form): it's the "layout-spec" GnomeDbBasicForm's property. Unfortunately it's not very documented at the moment.
Basically you'll need to create your own GnomeDbFormLayoutSpec structure and fill its attributes, and pass it as the "layout-spec" property.
In this structure, you'll have to pass a Glade XML file and a prefix string. The Glade UI must have a GtkBox for each entry libgnomedb will automatically add, and named "<prefix_string>_<parameter_number>". For example you can set the form_prefix attribute to "my" and have a GtkVBox object named "my_0" in which libgnomedb will put the GnomeDbDataEntry corresponding to the 1st parameter.
To help you, you can have a look at the libgnomedb/gnome-db-basic-form.c file lines 750+
I'm sorry there is not enough documentation for now.
Regards,
Vivien
