How to make it move correctly?

Question

I made a simple Flex application. There is a helicopter which
will move to points that user clicks in the canvas. For example, it
is at A point. When I click at B point, the helicopter will move to
B. Then it will move to C when I click at C.
However, the problem arises when I click at B, C, D
continuously. It moved from A to B. However, I don't think it moved
from B to C. Maybe it moved from B' to C.
Please tell me how to make it move correctly.
[CODE]
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import flash.events.Event;
import mx.controls.Alert;
[Embed(source="library.swf", symbol="Helicopter")]
public var MayBay:Class;
[Bindable]
public var xF:Number;
[Bindable]
public var xT:Number;
[Bindable]
public var yF:Number;
[Bindable]
public var yT:Number;
public function onCanvasClick(event:Event):void
var x:Number= myCanvas.mouseX;
var y:Number= myCanvas.mouseY;
var oX:Number=h1.x;
var oY:Number=h1.y;
xF=oX;
yF=oY;
xT=x;
yT=y;
MoveEffect.play();
// Alert.show("x="+x+" y="+y+" xOld="+oX+" yOld="+oY);
]]>
</mx:Script>
<mx:Move id="MoveEffect" target="{h1}" xFrom="{xF}"
yFrom="{yF}" xTo="{xT}" yTo="{yT}" duration="2000" >
</mx:Move>
<mx:states>
<mx:State id="NewState">
</mx:State>
</mx:states>
<mx:Panel width="70%" height="50%" title="Vi du">
<mx:Canvas click="onCanvasClick(event)" id="myCanvas"
width="100%" height="100%" color="White">
<mx:Image id="h1" source="{MayBay}" width="80"
height="50">
</mx:Image>
</mx:Canvas>
</mx:Panel>
</mx:Application>
[/CODE]

Answer 1

Make clicking disabled when the helicopter is moving. So
right after a click, disable clicking.
There are many coding possibilities for doing so. Make your
own, then add the code below after it:
MoveEffect.addEventListener("effectEnd",
callHandlerFunctionOfSomeSort);
private function callHandlerFunctionOfSomeSort(e:Event):void
// In this section, re-enable it using your own method.
Good luck!