Ensembles for multi-class predictions

I have trained two models using the caret library for R and would like to
combine the two multi-class trained models into one ensemble.

My first thought was to use caretEnsemble, but it does not yet support
multi-class predictions. See
https://github.com/zachmayer/caretEnsemble/issues/8

Is there a tutorial or sample code you can point me to showing how to
combine two or more multi-class trained models?