Use ChangeWatcher to monitor change of variables

Question

I am trying to find an easy way to monitor the change of
variables. Is ChangeWatch a good way to do it? I found it is used
with binding a lot and quite complicated. Has anyone used it to
monitor a change to variables?

Answer 1

Now I have a bit of a problem. While this solution works perfect with a variable, it has an error when using a variable from ModelLocator as a class.
BindingUtils.bindSetter(change_bindingHandler, this, "ModelLocator.getInstance().varName");
The error is: "Property ModelLocator.getInstance().varNamenot found on MainScreen and there is no default value."
// MainScreen.mxml code:
<view:MainScreenClass
    xmlns:model="com.myname.model.*"
    xmlns:view="com.myname.view.*"
    xmlns:mx="http://www.adobe.com/2006/mxml"
    width="100%" height="100%" horizontalAlign="center"
>
</view:MainScreenClass >
// MainScreenClass.as:
package org.nfcu.view
    public class MainScreenClass extends VBox {
        public function MainScreenClass() {
            super();
        public function setVariablesWatcher():void {
            BindingUtils.bindSetter(change_bindingHandler, this, "ModelLocator.getInstance().varName");