Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
* on a design tree. Note subclasses should override this method to change
	 * the behavior of broadcast method.
	 * 
	 * Part of: Notification system.
	 * 
	 * @param ev
	 *            the event to send
	 * @param module
	 *            the root node of the design tree.
	 */
	public void broadcast( NotificationEvent ev, Module module )
	{
		
		
		
		if ( listeners != null )
		{
			ArrayList tmpListeners = new ArrayList( listeners );
			Iterator iter = tmpListeners.iterator( );
			while ( iter.hasNext( ) )
			{
				( (Listener) iter.next( ) ).elementChanged(
						getHandle( module ), ev );
			}
		}
		
		if ( derived != null )
		{