Aligning widgets in a set of vboxes and hboxes

[Jaap Haitsma <jaap haitsma org>]

Hi,

I'd like to align a number of widgets which are in vboxes and hboxes. 
The dialog is very similar to the File Management Preferences dialog of 
nautilus [1].

The only problem is that if I run my application my comboboxes do not 
have the same size. They do in nautilus. If you load the nautilus glade 
file in glade they also don't seem to have the same size but if you run 
nautilus they have.

I've been trying for hours now to find out what the difference is, but I 
can't seem to find it.

Does anybody know which property I need to set, to get my comboboxes all 
of the same size?? (I can't use a table because as in the nautilus 
dialog I have different "sections" in the dialog)


Thanks

Jaap


[1] http://jaap.haitsma.org/shot.png