* If you bind a callback function to a KeyMap, anytime the KeyMap handles an expected key
* combination it will call the function with this signature (if the match is a multi-key
* combination the callback will still be called only once): (String key, Ext.EventObject e)
* If you bind a callback function to a KeyMap, anytime the KeyMap handles an expected key
* combination it will call the function with this signature (if the match is a multi-key
* combination the callback will still be called only once): (String key, Ext.EventObject e)