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/impl/HandledItemImpl.java
public MCommand basicGetCommand() {
		return command;
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setCommand(MCommand newCommand) {
		MCommand oldCommand = command;
		command = newCommand;
		if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, MenuPackageImpl.HANDLED_ITEM__COMMAND, oldCommand, command));
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ParameterizedCommand getWbCommand() {
		return wbCommand;
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setWbCommand(ParameterizedCommand newWbCommand) {
		ParameterizedCommand oldWbCommand = wbCommand;
		wbCommand = newWbCommand;