Developing a MVC Component/Adding a model to the site part
From Joomla! Documentation
this is confusing because it looks like your method should be getMsg not get('msg')
I agree, that's why I prefer to use (on the view):
$model = &$this->getModel();
$this->msg = $model->getMsg();
It's less confusing and it works fine also
--Apaulo 14:30, 2 June 2011 (CDT)