Category[] supported = {WORKSPACE, DATE, WORKBENCH_TOOL};
categoryProvider = new CategoryProvider(supported, WORKBENCH_TOOL);
categoryProvider.addObserver(this);
realContentProvider = new TreePathContentProvider(
new PartDataTreeBuilder(categoryProvider));
realContentProvider.addObserver(this);
durationProvider = createDurationValueProvider();
durationProvider.addObserver(this);