[flexcoders] hi! this examples didn't work out,please help

[ashlytu]

when I read "the Essential guide to flex 3"
from page 87 to 95, there is a example , in the application MXML ,the
code is

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
layout="absolute" xmlns:local="*">
    <mx:Script>
        <![CDATA[
            
                public var myProperty:String = myComponent.myFirstProperty;
        
        ]]>
    </mx:Script>
        <local:MyFirstComponent  id="myComponent" myFirstProperty="Welcome to
Flex" />
    <mx:Label text="{myComponent.myFirstProperty}" id="myLabel"/>
    
</mx:Application>

and in the component file :MyFirstComponent ,is just these code below:

<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"; width="400"
height="300">
        <mx:Script>
                <![CDATA[
                        [Bindable]
                        public var myFirstProperty:String;
                ]]>
        </mx:Script>
</mx:Canvas>

I followed all the steps, and would like to view the value of
"myProperty" in the script section of the Application MXML file, in
the Expressionis frame, but the error was "TypeError: Error #1009:",
It's seems like "myProperty" cannot get the value from a object attribute.

what is wrong with it?
Thanks a lot!

Ashly