org.eclipse.mylyn.tasks.activity.ui/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="org.eclipse.mylyn.tasks.ui.taskEditorPageContribution">
      <repositoryPart
            class="org.eclipse.mylyn.internal.tasks.activity.ui.ActivityPart"
            id="org.eclipse.mylyn.tasks.activity.ui.viewer.ActivityPart"
            path="associations">
      </repositoryPart>
   </extension>

</plugin>