help plz

[ChanYoung-dev]

Module.register("MMM-Test", {
defaults: {},
start: function (){},

getDom: function() {
var element = document.createElement("div")
element.className = "myContent"
element.innerHTML = "Hello, World! " + this.config.foo
var subElement = document.createElement("p")
subElement.innerHTML = "Test"
subElement.id = "TEST"
element.appendChild(subElement)
return element
},

notificationReceived: function(notification, payload, sender) {
switch(notification) {
case "DOM_OBJECTS_CREATED":
var elem = document.getElementById("TEST")
elem.addEventListener("click", function(){
elem.innerHTML = "TEST2"
this.sendNotification('CHANGE_POSITIONS',
modules = {
'clock':{
visible: 'true',
position: 'top_left',
},
}
);
})

  break

}
},
})

It's a simple test. But it doesn't even work. What's the problem?
MMM-Test.js:23 Uncaught TypeError: this.sendNotification is not a function
at HTMLParagraphElement.