The _listeners_ object is a name value pair, where the name is the 
name of the event, and the value is either a function or the string
name of the function in the view's controller (or controllers up the
containment hierarchy). 

    listeners: {
        change: data=>console.log(data),
        focusChange: data=>console.log(data)
    },


    listeners: {
        change: 'onChange',
        focusChange: 'onFocusChange'
    },


