Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/ReferenceableElement.java
*/
	protected void broadcastToClients( NotificationEvent ev, Module module )
	{
		for ( int i = 0; i < clients.size( ); i++ )
		{
			DesignElement target = ( (BackRef) clients.get( i ) ).element;
			target.broadcast( ev, module );
		}
	}
	/**
	 * Updates the element reference which refers to the given referenceable
	 * element.
	 * 
	 */
	public void updateClientReferences( )
	{
		
		Iterator backRefIter = new ArrayList( clients ).iterator( );
		while ( backRefIter.hasNext( ) )
		{
			BackRef ref = (BackRef) backRefIter.next( );
			DesignElement client = ref.element;
			Module root = client.getRoot( );
			Object value = client.getLocalProperty( root, ref.propName );
			if ( value instanceof ElementRefValue )
			{
				ElementRefValue refValue = (ElementRefValue) value;
				refValue.unresolved( refValue.getName( ) );
				dropClient( client );
			}