Zoom Brush and Pen are become transparent when you set a brush color. Also, the pen keeps the default color if the pen zoom color is changed. The problems don't occur in build number 2.0.0.801 (27th April 2009 maintenance release).

The code below reproduce the both problems: 
	private static void initializeChart() 
	{
		tChart1.getAspect().setView3D(false);
		tChart1.getLegend().setAlignment(LegendAlignment.BOTTOM);
		tChart1.getLegend().setLegendStyle(LegendStyle.SERIES);
		tChart1.getLegend().getFont().setSize(20);
		tChart1.getHeader().getFont().setSize(25);
		tChart1.getAxes().getLeft().getTitle().getFont().setSize(15);
		tChart1.getAxes().getLeft().getLabels().getFont().setSize(15);
		tChart1.getAxes().getBottom().getLabels().getFont().setSize(15);
		ThemesList.applyTheme(tChart1.getChart(), 1);
		Line series1 = new Line(tChart1.getChart()); 
		
		series1.fillSampleValues();
		tChart1.getZoom().getBrush().setSolid(true);//Comment the line to see the pen problem. 
		tChart1.getZoom().getBrush().setVisible(true);//Comment the line to see the Pen problem. 
	    tChart1.getZoom().getBrush().setColor(Color.LIGHT_YELLOW);//Comment the line to see the Pen problem.
	   // tChart1.getZoom().getPen().setColor(Color.red); //Uncomment the line to see the Pen problem.
	   }