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/MHandledItem.java
* @see #setWbCommand(ParameterizedCommand)
	 * @model dataType="org.eclipse.e4.ui.model.application.commands.ParameterizedCommand" transient="true"
	 * @generated
	 */
	ParameterizedCommand getWbCommand();
	/**
	 * Sets the value of the '{@link org.eclipse.e4.ui.model.application.ui.menu.MHandledItem#getWbCommand <em>Wb Command</em>}' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @param value the new value of the '<em>Wb Command</em>' attribute.
	 * @see #getWbCommand()
	 * @generated
	 */
	void setWbCommand(ParameterizedCommand value);
	/**
	 * Returns the value of the '<em><b>Parameters</b></em>' containment reference list.
	 * The list contents are of type {@link org.eclipse.e4.ui.model.application.commands.MParameter}.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Parameters</em>' containment reference list isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Parameters</em>' containment reference list.
	 * @model containment="true"
	 * @generated
	 */
	List<MParameter> getParameters();
}