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/DesignElement.java
* Resolves a property element reference. The reference is the value of a
	 * property of type property element reference.
	 * 
	 * @param module
	 *            the module information needed for the check, and records any
	 *            errors
	 * @param prop
	 *            the property whose type is element reference
	 * @return the element reference value is always returned, which contains
	 *         the information of element resolution.
	 */
	public ElementRefValue resolveElementReference( Module module,
			ElementPropertyDefn prop )
	{
		Object value = propValues.get( prop.getName( ) );
		assert value == null || value instanceof ElementRefValue;
		if ( value == null || module == null )
			return (ElementRefValue) value;
		ElementRefValue ref = (ElementRefValue) value;
		if ( ref.isResolved( ) )
			return ref;
		
		
		
		
		
		
		ElementRefPropertyType refType = (ElementRefPropertyType) prop
				.getType( );
		refType.resolve( module, prop, ref );