[gatein-dev] How to use Chromattic to add a mixin

I am trying to use Chromattic to add a mixin to a component in the JCR, but I am running into a bunch of issues (and Chromattic is lacking in documentation). I need to use a mixin so that we can update the component and still remain backwards compatible when starting with data from an older install. When trying to use ChromatticSession.create on a mixin object and then setting a property on this newly created object, Chromattic is failing with an NPE exception (note: not an NPE exception in that the object is null, but from internal Chromattic classes when it tries to set the value). If I just try and add the mixin to an node using setEmbedded, it fails saying that the EntityContext can't add this particular mixin, and going through the Chromattic code, it does appear that each node has a list of particular mixins it can support. How does one add mixins to the supported mixin list? Is there any example somewhere on how to add any generic mixin to a normal node using Chromattic? I am a noob at chromattic and the jcr in general, so maybe I am doing something obviously wrong :/ Thanks, Matt Wringe