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
* <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Popup Menu</em>'.
	 * @generated
	 */
	MPopupMenu createPopupMenu();
	/**
	 * Returns a new object of class '<em>Direct Menu Item</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Direct Menu Item</em>'.
	 * @generated
	 */
	MDirectMenuItem createDirectMenuItem();
	/**
	 * Returns a new object of class '<em>Handled Menu Item</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Handled Menu Item</em>'.
	 * @generated
	 */
	MHandledMenuItem createHandledMenuItem();
	/**
	 * Returns a new object of class '<em>Tool Bar</em>'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return a new object of class '<em>Tool Bar</em>'.
	 * @generated
	 */
	MToolBar createToolBar();