Bug 193467 URL hyperlink can't work in chart viewer
chart/org.eclipse.birt.chart.viewer/src/org/eclipse/birt/chart/viewer/internal/util/ChartImageManager.java
idr.setProperty( IDeviceRenderer.DPI_RESOLUTION, new Integer( dpi ) );
			if ( "SVG".equalsIgnoreCase( sExtension ) ) 
			{
				idr.setProperty( "resize.svg", Boolean.TRUE ); 
			}
			
			final Bounds originalBounds = cm.getBlock( ).getBounds( );
			
			
			final Bounds bo = (Bounds) EcoreUtil.copy( originalBounds );
			GeneratedChartState gcs = gr.build( idr.getDisplayServer( ),
					cm,
					bo,
					externalContext,
					rtc,
					styleProc );
			
			ByteArrayOutputStream baos = new ByteArrayOutputStream( );
			BufferedOutputStream bos = new BufferedOutputStream( baos );
			idr.setProperty( IDeviceRenderer.FILE_IDENTIFIER, bos );
			idr.setProperty( IDeviceRenderer.UPDATE_NOTIFIER,
					new EmptyUpdateNotifier( cm, gcs.getChartModel( ) ) );
			gr.render( idr, gcs );
			
			
			
			try
			{
				fis = new ByteArrayInputStream( baos.toByteArray( ) );
				bos.close( );