Bug 317702 ToolItemRenderer needs to consider menus for dropdown tool items
The instantiated ToolItem does have the correct SWT.DROP_DOWN style but clicking on it does nothing.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ToolItemRenderer.java
final MItem item = (MItem) me;
			if (item.getType() == ItemType.CHECK
					|| item.getType() == ItemType.RADIO) {
				ToolItem ti = (ToolItem) me.getWidget();
				ti.addSelectionListener(new SelectionListener() {
					public void widgetSelected(SelectionEvent e) {
						item.setSelected(((ToolItem) e.widget).getSelection());
					}
					public void widgetDefaultSelected(SelectionEvent e) {
						item.setSelected(((ToolItem) e.widget).getSelection());
					}
				});
			}
		}
		
		if (me instanceof MContribution
				&& ((MContribution) me).getContributionURI() != null) {
			final MToolItem item = (MToolItem) me;
			final MContribution contrib = (MContribution) me;
			final IEclipseContext lclContext = getContext(me);
			ToolItem ti = (ToolItem) me.getWidget();
			ti.addSelectionListener(new SelectionListener() {
				public void widgetSelected(SelectionEvent e) {
					if (contrib.getObject() == null) {
						IContributionFactory cf = (IContributionFactory) lclContext
								.get(IContributionFactory.class.getName());
						contrib.setObject(cf.create(
								contrib.getContributionURI(), lclContext));
					}
					lclContext.set(MItem.class.getName(), item);