Bug 304074 View toolbars don't go away when the view is closed
1. Run the compatibility layer. 2. Close the 'Package Explorer' view. 3. Its toolbar is still there.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
if (ctf.getTopRight() != null)
					stylingEngine.setClassname(ctf.getTopRight(), cssClassName);
				
				
				CTabItem[] items = ctf.getItems();
				for (int i = 0; i < items.length; i++) {
					stylingEngine.setClassname(items[i], cssClassName);
				}
				return true;
			}
		};
		ctf.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				updateActiveTab.participating = false;
				folderContext.set(FOLDER_DISPOSED, Boolean.TRUE);
			}
		});
		folderContext.runAndTrack(updateActiveTab, null);
		return newWidget;
	}
	protected void createTab(MElementContainer<MUIElement> stack,
			MUIElement part) {
		MUILabel itemPart = (MUILabel) part;
		CTabFolder ctf = (CTabFolder) stack.getWidget();
		CTabItem cti = findItemForPart(part);
		if (cti != null)
			return;
		int createFlags = SWT.NONE;