Bug 142928 Item from library is changed to a report design item after revert to report item
Details: Item from library is changed to a report design item after revert to report item. Setp: 1.New a template. 2.Use a libary contain a label. 3.Drop the label from library explorer into layout. 4.Change the label to template item. 5.Revert the template item to report item. Actual result: The label is become a report item, but a item from library. Please see the attach image. Exception result: The lable is revert a item from library.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
/**
	 * Registers a change event listener. A listener receives notifications each
	 * time an element changes. A listener can be registered any number of
	 * times, but will receive each event only once.
	 * 
	 * @param obj
	 *            the listener to register
	 */
	public void addListener( Listener obj )
	{
		getElement( ).addListener( obj );
	}
	/**
	 * Removes a given listener. If the listener registered, then the request is
	 * silently ignored.
	 * 
	 * @param obj
	 *            the listener to de-register
	 */
	public void removeListener( Listener obj )
	{
		getElement( ).removeListener( obj );
	}
	/**
	 * Returns an iterator over the elements that derive from this one.
	 * 
	 * @return an iterator over the elements that derive from this one. Each
	 *         item returned by the iterator's <code>getNext( )</code> method
	 *         is of type {@link DesignElementHandle}.
	 */