You can use getModel
which is defined in goog.ui.component and it should be available to ComboBoxitem thru Prototype Inheritance
goog.Disposable >> goog.events.EventTarget >> goog.ui.Component >> goog.ui.Control >> goog.ui.MenuItem >> goog.ui.ComboBoxItem
goog.ui.Component.prototype.getModel = function() {
return this.model_;
};
https://code.google.com/p/closure-library/source/browse/closure/goog/ui/component.js
Documentation - http://docs.closure-library.googlecode.com/git/class_goog_ui_ComboBoxItem.html [ find GetModel ]