Comment 61 for bug 595265

@Gillaume I didn't need to scroll.
Perhaps you haven't added the line correctly:
                  ........
                  <object class="GtkAlignment" id="alignment_create">
                    <property name="visible">True</property>
                    <property name="yalign">0</property> <!-- line added in 276 -->
                    <child>
                  ..........