Bug 317405 [Model] HandledItem should be abstract
Looks like an oversight the only real types are HandledMenuItem and HandledToolItem.
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/menu/MMenuFactory.java
* @return a new object of class '<em>Handled Item</em>'.
	 * @generated
	 */
	MHandledItem createHandledItem();
	/**
	 * Returns a new object of class '<em>Separator</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Separator</em>'.
	 * @generated
	 */
	MMenuSeparator createMenuSeparator();
	/**
	 * Returns a new object of class '<em>Menu</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Menu</em>'.
	 * @generated
	 */
	MMenu createMenu();
	/**
	 * Returns a new object of class '<em>Contribution</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Contribution</em>'.
	 * @generated
	 */
	MMenuContribution createMenuContribution();
	/**
	 * Returns a new object of class '<em>Popup Menu</em>'.