public void createPartControl(Composite parent) {
treeViewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
treeViewer.setContentProvider(new DroolsContentProvider());
treeViewer.setLabelProvider(new DroolsLabelProvider());
treeViewer.setSorter(new DroolsTreeSorter());
treeViewer.addDoubleClickListener(this);
treeViewer.setUseHashlookup(true);
treeViewer.setInput(ruleSet);
FilterActionGroup filterActionGroup = new FilterActionGroup(
treeViewer, "org.drools.eclipse.view.rules.RulesView");