Cedk: You can set the size of the dialog to something like (500, 300), but

to have the table with the right size, you must call
"dialog_vbox.pack_start(table)"
after filling all the table. (here it is just before
self.dialog.vbox.pack_start(dialog_vbox)

tryton/gui/window/dbcreate.py

@@ -271,6 +271,7 @@ class DBCreate(object):
         self.entry_adminpasswd2.connect("key-press-event", \
             self.event_passwd_clear)
         self.entry_serverpasswd.grab_focus()
+        dialog_vbox.pack_start(table)
         self.dialog.vbox.pack_start(dialog_vbox)
         self.sig_login = sig_login