Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
if ( htRenderers.containsKey( TIMER ) )
		{
			final Long l = (Long) htRenderers.get( TIMER );
			htRenderers.put( TIMER, new Long( l.longValue( ) + lTimer ) );
		}
		else
		{
			htRenderers.put( TIMER, new Long( lTimer ) );
		}
		if ( bLastInSequence )
		{
			Object obj = getComputations( );
			if ( obj instanceof PlotWith2DAxes )
			{
				final PlotWith2DAxes pw2da = (PlotWith2DAxes) getComputations( );
				pw2da.getStackedSeriesLookup( ).resetSubUnits( );
			}
			logger.log( ILogger.INFORMATION,
					Messages.getString( "info.elapsed.render.time", 
							new Object[]{
								new Long( lTimer )
							},
							getRunTimeContext( ).getULocale( ) ) );
			htRenderers.remove( TIMER );
		}
	}
	private final int compare( DataElement de1, DataElement de2 )
			throws ChartException
	{
		if ( de1 == null && de2 == null )