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
*            the module
	 * @param propName
	 *            name of the property to get. Can be a system-defined or
	 *            user-defined property name. Must be of the correct case.
	 * @return The property value, or null if no value is set.
	 */
	public Object getProperty( Module module, String propName )
	{
		ElementPropertyDefn prop = getPropertyDefn( propName );
		
		if ( prop == null )
			return null;
		return getProperty( module, prop );
	}
	/**
	 * Returns the property value from this element's parent, or any ancestor.
	 * The value is only from local properties, or local style of its ancestor.
	 * 
	 * @param module
	 *            module
	 * @param prop
	 *            definition of the property to get.
	 * @return property value, or null if no value is set.
	 */
	protected Object getPropertyFromParent( Module module,
			ElementPropertyDefn prop )
	{
		Object value = null;
		DesignElement e = getExtendsElement( );
		while ( e != null )