ScrollPane scroll = new ScrollPane();
		scroll.setBounds(panel.getBounds());
		ScrollableThumbnail thumbnail = new ScrollableThumbnail();
		thumbnail.setViewport(scroll.getViewport());
		thumbnail.setBorder(new GroupBoxBorder("Overview Figure"));
		thumbnail.setSource(source);

java.lang.NullPointerException
at org.eclipse.draw2d.parts.ScrollableThumbnail.reconfigureSelectorBounds(ScrollableThumbnail.java:249)
at org.eclipse.draw2d.parts.ScrollableThumbnail.setScales(ScrollableThumbnail.java:273)
at org.eclipse.draw2d.parts.Thumbnail.setSource(Thumbnail.java:533)
at draw2d.tw.DrawingBoard.createThumbnail(DrawingBoard.java:177)
at draw2d.tw.DrawingBoard.updateMiniMap(DrawingBoard.java:150)
at draw2d.tw.DrawingBoard.createMiniMap(DrawingBoard.java:141)
at draw2d.tw.DrawingBoard.<init>(DrawingBoard.java:128)
at draw2d.tw.ConstructionBoard.createContents(ConstructionBoard.java:106)
at draw2d.tw.ConstructionBoard.open(ConstructionBoard.java:51)
at draw2d.tw.ConstructionBoard.main(ConstructionBoard.java:40)