Here are an updated glade file with some GNOME HIG fixes:
* use proper spacing/border (also remove GtkFrame and use
GtkVbox + GtkAlignment)
* add mnemonics to widgets
Created attachment 13816 [details]
The new GLADE file
Committed, whit a small change: the vertical spacing between bottom buttons and other widget is 12 in dialog, not 24 as in alerts.