This is related to compiler changes following a specific request in users list. Changes were made to the compiler to help cairngorm ServiceLocator work in mxml.
@aharui : there was a change that added the following to an mxml subclass of ServiceLocator in a local test project (GithubCommitsViewer): this.generateMXMLAttributes ([2, 'configuratorService', false, [mx.rpc.http.mxml.HTTPService, 2, 'id', true, 'configuratorService', 'resultFormat', true, 'text', 0, 0, null], 'commitsService', false, [mx.rpc.http.mxml.HTTPService, 2, 'id', true, 'commitsService', 'resultFormat', true, 'text', 0, 0, null], 0, 0 ]); But the ServiceLocator class does not implement the generateMXMLAttributes method. So I can manually implement it on the original class (although this seems not necessary in Flex), like so: public function generateMXMLAttributes(descriptor:Array):void{ MXMLDataInterpreter.generateMXMLProperties(this, descriptor); } But that alone was not enough. I also had to change the original ServiceLocator class to extend from royale EventDispatcher because it was not being automatically 'upgraded' by the compiler to EventDispatcher (like Bindable does for regular actionscript VO classes, for example). Without this change the 'id' properties being set throw errors when the generated setter code tries to dispatch 'valueChange'. So the good news is I can get it to work. But it seems like we have some more things to address here to get it to automatically 'upgrade' the mxml definitions similar to Flex.