Please describe the problem:
The 'secondary' packing attribute for buttons in dialog boxes does not seem to work. To make a button secondary, the only way seems to be by setting its response_id to -11, aka GTK_RESPONSE_HELP. I don't think that this is the wanted behaviour.

Steps to reproduce:
1. open glade
2. create a simple dialog box with two buttons, setting one of them as secondary, and setting the buttonbox layout style to 'end' (which should be the default)
3. save as test.glade
4. display the window, for example with python:
import gtk, gtk.glade
xml = gtk.glade.XML('test.glade')
win = xml.get_widget('dialog1')
win.connect('destroy', gtk.main_quit)
win.show_all()
gtk.main()
5. resize the resulting dialog box

Actual results:
The two buttons stay grouped at the right edge of the dialog box.

Expected results:
The button set as secondary should stay at the left edge of the dialog box.

Does this happen every time?
Yes.

Other information:
A workaround is to set the response id of the button to -11, aka GTK_RESPONSE_HELP, which seems to be treated specially. However, since the correct behaviour can only be obtained with undocumented magic (I spent many hours trying to find why the gnome dialogs were working and not mine), I think that this is not a satisfactory solution.