[PyGTK] How to center text on multi-line buttons?

[Lomax]

Thanks guys! I think I found a better solution by editing the XML and adding an explicit <label> child to the <button>:

<object class="GtkButton">
  <child>
    <object class="GtkLabel">
      <property name="justify">center</property>
      <property name="label">Two&#xD;Lines</property>
    </object>
  </child>
</object>

Probably obvious to the more experienced, but I'm only just getting my feet wet with this.