Dynamically populating an ExtJS HTML editor

So I'm using ExtJS for a job I'm working and I'm trying to dynamically populate the textarea associated with the HTML editor with data based on what a user selects from a combo box. From 开发者_开发技巧what I've found, I can load the HTML editor with text using the defaultValue property. So if I'm going to populate it after the page loads, can I give it something like a datastore or is there a method I can call to set the text?

Just call foo.setValue("bar");, like with all form inputs.
http://www.extjs.com/deploy/dev/docs/source/Field.html#method-Ext.form.Field-setValue
http://www.extjs.com/deploy/dev/docs/?class=Ext.form.HtmlEditor