Bug 305707 add a way to contribute object providers to dependency injection
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/PartServiceImpl.java
rootContainer = (MElementContainer<MUIElement>) childContext
								.get(MWindow.class.getName());
					}
					return true;
				}
			}, null);
		}
	}
	@PreDestroy
	void preDestroy() {
		constructed = false;
		eventBroker.unsubscribe(selectedHandler);
	}
	private void firePartActivated(MPart part) {
		for (Object listener : listeners.getListeners()) {
			((IPartListener) listener).partActivated(part);
		}
	}
	private void firePartDeactivated(MPart part) {
		for (Object listener : listeners.getListeners()) {
			((IPartListener) listener).partDeactivated(part);
		}
	}
	private void firePartHidden(MPart part) {
		for (Object listener : listeners.getListeners()) {
			((IPartListener) listener).partHidden(part);
		}
	}
	private void firePartVisible(MPart part) {
		for (Object listener : listeners.getListeners()) {