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/core/Module.java
* @param slotId
	 *            the id of themes/styles slot
	 */
	private void updateReferenceableClients( DesignElement target, int slotId )
	{
		ContainerSlot slot = target.getSlot( slotId );
		Iterator iter = slot.iterator( );
		while ( iter.hasNext( ) )
		{
			DesignElement element = (DesignElement) iter.next( );
			assert element instanceof ReferenceableElement;
			ReferenceableElement referenceableElement = (ReferenceableElement) element;
			
			updateClientReferences( referenceableElement );
			
			if ( referenceableElement instanceof Theme )
				updateReferenceableClients( referenceableElement,
						Theme.STYLES_SLOT );
		}
	}
	/**
	 * Updates the element reference which refers to the given referenceable
	 * element.
	 * 
	 * @param referred
	 *            the element whose element references are updated
	 */
	public void updateClientReferences( ReferenceableElement referred )
	{
		List clients = referred.getClientList( );