public static final String PLOT_TYPE = "default plot";
@Override
public IObserverListener create(ParameterBlock parameter, Context context) {
IColoredPlot type = null;
String t = ParameterBlocks.getSubBlockValue(parameter, PLOT_TYPE);
if (t != null) {
try {
PlotFactory factory =
(PlotFactory) SimSystem.getRegistry().getFactory(t);