Bug 307577 [UI] Allow the CSS engine access to the 'tag' info
We need to define multiple CSS 'class' names to allow clients to style against tag information (such as "View", "ViewStack"...). We will also add the model element's type ("MWindow", "MPart"...) This will allow for example style sheets that have all stacks use a particular tab style but also allow it to differentiate the style of a "PartStack" from that of an "EditorStack".
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/SWTPartRenderer.java
widget.setData(OWNING_ME, null);
		}
		
		me.setRenderer(null);
		return widget;
	}
	protected Widget getParentWidget(MUIElement element) {
		return (Widget) element.getParent().getWidget();
	}
	public void disposeWidget(MUIElement element) {
		Widget curWidget = (Widget) element.getWidget();
		if (curWidget != null && !curWidget.isDisposed()) {
			unbindWidget(element);
			curWidget.dispose();
		}
		element.setWidget(null);
	}
	public void hookControllerLogic(final MUIElement me) {
		Widget widget = (Widget) me.getWidget();
		
		widget.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				MUIElement model = (MUIElement) e.widget.getData(OWNING_ME);
				if (model != null)
					model.setWidget(null);
			}
		});
		
		
		if (widget instanceof Control && me instanceof MUILabel) {