contextMap = new HashMap();
	SwtInteractivityViewer( Composite parent, int style )	{		super( parent, style );		final PluginSettings ps = PluginSettings.instance( );		try		{			idr = ps.getDevice( "dv.SWT" );//$NON-NLS-1$			idr.setProperty( IDeviceRenderer.UPDATE_NOTIFIER, this );		}		catch ( ChartException ex )		{			ex.printStackTrace( );		}		cm = InteractivityCharts.createHSChart( );	}