Flex: access of undefined property

Hi all,

I suppose I'm overlooking something very basic, but I can't get something very simple to work.
I try, for example, to access a Graphic from the script block in Flex like this:
immibgroundRect.alpha = 0.5;
The graphic is like this:

PHP Code:

---

    <s:Graphic id="immi" toolTip="{'immigratie: '}{Number(data.immi)*10000}">
        <s:Rect id="immibgroundRect" 
                width="{Number(data.immi)*9}" height="26" 
                x="{Number(data.pop)*9}" y="0">
            <s:fill>
                <s:BitmapFill source="@Embed('../assets/man-in.png')" fillMode="repeat"/>
            </s:fill>            
        </s:Rect>
    </s:Graphic> 


---

The names match and both highlight grey when I select them yet I get the error:
1120: Access of undefined property immibgroundRect.

What am I missing here? Thanks very much in advance for your help.

When are you calling the id? May be the Rect is not yet created.

Hi cancerinform, you are right, as ever ;)
I've added a creationComplete event and put the everything in a handler like this:

PHP Code:

---

protected function immi_creationCompleteHandler(event:FlexEvent):void
            {
                TweenLite.to(immibgroundRect, 1, {x:"-100"});
            } 


---

Now it works, thanks for your advice.