1120: Access of undefined property myTest

Question

I am learning Actionscript 3.0 and Flex 3 but am having a
very hard time trying to understand error 1120. I come from a c++
background so OOP is not new to me.
I create the object instance of the imported class but then I
cannot call those object functions on the object I have created. I
am guessing there is some kind of scoping issue but I have not been
able to find a simple example of how to create an object from a
class and then use its functions on the object.
Any help would be greatly appreciated (with explanations
hopefully). Code attached.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import com.smyrin.*;
public var myTest:EntryClass = new EntryClass();
myTest.addNum (); <--------- 1120 error here!
]]>
</mx:Script>
</mx:Application>
package com.smyrin
public class EntryClass {
private var num:Number;
public function EntryClass () {
num = 10;
public function addNum ():void {
num = num + 5;
}

Answer 1

The following example illustrates how an MXML file can
communicate with class objects of an imported Actionscript file in
Flex 3.0.
MXML File:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="init()">
<mx:Script>
<![CDATA[
//This example shows how to instantiate a class object of an
actionscript file and to
//call class functions on that object. Please note I am by
no means an expert but have
//figured this out through research and experimentation.
Feel free to correct me where
//I may be wrong.
//Import actionscript file.
import com.sample.SampleClass;
//Create variable to class object(s).
public var myObject:SampleClass;
//Initialize class objects.
public function init():void {
myObject = new SampleClass ();
//Now we can use the class functions thru the class object.
//See button control click value.
]]>
</mx:Script>
<mx:VBox x="10" y="10" width="300" height="300"
horizontalAlign="center" id="verticalBox">
<mx:Button label="Add Text Box" id="myButton"
click="myObject.doSomething ()"/>
</mx:VBox>
</mx:Application>
ACTIONSCRIPT File:
//I like to put my packages in a domain name as Flex 3
suggests.
package com.sample {
//Import list.
import mx.controls.Text;
import mx.core.Application; //Class needs access to
Application class.
//It is very important to extend this class with an
appropriate superclass.
//I chose Application but others work as well such as
Sprite, etc... This will
//clear up those pesky 1120 errors.
public class SampleClass extends Application {
//Class Variables:
public var str:String //Dummy variable.
public var myTextBox:Text; //Text box variable.
//Constructor
public function SampleClass () {
//I usually use the constructor to initialize all the class
//variables that I need for the functions.
str = "Hello World!";
myTextBox = new Text ();
//Simple function that is called by the click of a button in
the
//mxml file. The function accesses the application container
and
//adds myTextBox containing the value of str.
public function doSomething ():void {
myTextBox.text = str;
Application.application.verticalBox.addChild (myTextBox);
}