TREE_VERT = new TreeLayoutAlgorithm(LayoutStyles.NONE);
TREE_HORIZ = new HorizontalTreeLayoutAlgorithm(LayoutStyles.NONE);
RADIAL = new RadialLayoutAlgorithm(LayoutStyles.NONE);
GRID = new GridLayoutAlgorithm(LayoutStyles.NONE);
HORIZ = new HorizontalLayoutAlgorithm(LayoutStyles.NONE);
VERT = new VerticalLayoutAlgorithm(LayoutStyles.NONE);
SPRING.setIterations(1000);
// initialize layouts
TREE_VERT.setComparator(new Comparator() {
public int compare(Object o1, Object o2) {