[OpenMap Users] Using OverViewMapHandler to create an overview map

I am using the classes OverViewMapHandler & ShapeLayer in the API to display
an overview map. I started out using the simplemap2.java and added to it
until I created the complete OpenMap application using API calls rather then
the properties file. It seems to work OK but when I select a rectangular
area on the overview map it does not draw smoothly. The rectangle seems to
disappear as I draw it. When I let go of the mouse button to finish
drawing, the rectangle appears in the overview and the main map zooms
appropriately. When I select another area, the map zooms again to the
correct area but the previously selected area still has the rectangle
showing in the overview map. Why does it not get erased? When I minimize
the overview map and then open it up again the lines are erased. I guess
probably from a repaint. Why are they not erased when I select an different
area?

A snip of the code is:

          Properties overviewLayerProps = new Properties();
          overviewLayerProps.put("prettyName", "CrrelView OverView");
          overviewLayerProps.put("lineColor", "ff000000");
          overviewLayerProps.put("fillColor", "ffbdde83");
          overviewLayerProps.put("shapeFile",
"C:/CrrelView/Maps/dcwpo-browse.shp");
          overviewLayerProps.put("spatialIndex",
"C:/CrrelView/Maps/dcwpo-browse.ssx");
          ShapeLayer overviewLayer= new ShapeLayer();
          overviewLayer.setVisible(true);

          overviewLayer.setProperties(overviewLayerProps);
          OverviewMapHandler overviewMapHandler = new OverviewMapHandler();
          overviewMapHandler.setScaleFactor(10);
          overviewMapHandler.setMinScale(10000000);
          ShapeLayer[] overviewLayers = {overviewLayer};
          overviewMapHandler.setLayers(overviewLayers);
          overviewMapHandler.setStatusLayer(new
com.bbn.openmap.layer.OverviewMapAreaLayer());

          mapHandler.add(overviewMapHandler);

Also when I resize the overview map I get the error:

java.lang.NullPointerException:
        at com.bbn.openmap.gui.OverviewMapHandler.componentResized(Unknown Source)
        at java.awt.Component.processComponentEvent(Component.java:3042)
        at java.awt.Component.processEvent(Component.java, Compiled Code)
        at java.awt.Container.processEvent(Container.java, Compiled Code)
        at java.awt.Window.processEvent(Window.java:625)
        at java.awt.Component.dispatchEventImpl(Component.java, Compiled Code)
        at java.awt.Container.dispatchEventImpl(Container.java, Compiled Code)
        at java.awt.Window.dispatchEventImpl(Window.java, Compiled Code)
        at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java, Compiled Code)
        at
java.awt.EventDispatchThread.pumpOneEventForComponent(EventDispatchThread.ja
va, Compiled Code)
        at
java.awt.EventDispatchThread.pumpEventsForComponent(EventDispatchThread.java
:89)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:84)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:76)

Luke

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