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
}
	/**
	 * Return a list of user-defined message keys. The list contained resource
	 * keys defined in the report itself and the keys defined in the referenced
	 * message files for the current thread's locale. The list returned contains
	 * no duplicate keys.
	 * 
	 * @return a list of user-defined message keys.
	 */
	public List getMessageKeys( )
	{
		Set keys = new LinkedHashSet( );
		String[] transKeys = translations.getResourceKeys( );
		if ( transKeys != null )
		{
			for ( int i = 0; i < transKeys.length; i++ )
				keys.add( transKeys[i] );
		}
		
		
		String baseName = getStringProperty( this, INCLUDE_RESOURCE_PROP );
		if ( baseName == null )
			return new ArrayList( keys );
		File msgFolder = getModuleFolder( );
		if ( msgFolder == null )
			return new ArrayList( keys );
		Collection msgKeys = BundleHelper.getHelper( msgFolder, baseName )
				.getMessageKeys( ThreadResources.getLocale( ) );
		keys.addAll( msgKeys );
		return new ArrayList( keys );