Do explicit pygtk initialization on application startup.

gaphor/UML/diagram.py

@@ -5,7 +5,6 @@ representation of a UML diagram. Diagrams can be visualized and edited.
 """
 
 from zope import component
-import gobject
 import gaphas
 import uuid
 from uml2 import Namespace, PackageableElement

gaphor/__init__.py

@@ -9,6 +9,9 @@ import os
 
 import misc.logger
 
+import pygtk
+pygtk.require('2.0')
+
 if os.name == 'nt':
     home = 'USERPROFILE'
 else:

gaphor/ui/__init__.py

@@ -3,5 +3,4 @@ This module contains user interface related code, such as the
 main screen and diagram windows.
 """
 
-
 # vim:sw=4:et: