Bug 121352 The data set binding property cannot be retrieved in report preview layout
In report preview page, the datasource/dataset property binding lists cannot be retrieved. The dataset binding can not work correctly in layout preview because it's value cannot get from the binding list. But in the data set edit page, the binding value can be got. You can refer to the attachment.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentReplaceRecord.java
if ( isSelector( oldElement ) )
				retValue.add( new NotificationRecordTask( oldElement, event,
						container.getRoot( ) ) );
		}
		return retValue;
	}
	/**
	 * Gets the event sent to the container after the record executes.
	 * Subclasses can override this method to manage the event sent to the
	 * container.
	 * 
	 * @return the event sent to the container after the record executes
	 */
	protected NotificationEvent getContainerEvent( )
	{
		NotificationEvent event = null;
		
		
		if ( state != UNDONE_STATE )
			event = new ContentReplaceEvent( container, oldElement, newElement,
					slotID );
		else
			event = new ContentReplaceEvent( container, newElement, oldElement,
					slotID );
		if ( state == DONE_STATE )
			event.setSender( sender );
		return event;
	}
}