SessionHandleAdapter.getInstance().getMediator().addColleague(this);
	protected void createGraphicalViewer( Composite parent )	{		DeferredGraphicalViewer viewer = new DeferredGraphicalViewer( );		viewer.hookRefreshListener( getRefreshManager( ) );		viewer.createControl( parent );		setGraphicalViewer( viewer );		configureGraphicalViewer( );		hookGraphicalViewer( );		initializeGraphicalViewer( );		//addAction ( new ToggleRulerVisibilityAction(		// this.getGraphicalViewer() ));	}