How to get correct coordinate & size of components in scaled swf

I use canvas (I set it to fit whole screen size) to enclose a swfloader which loads a swf with width & height set to 100%. This swf has a movieclip. How can I get the correct coordinates of its position and its size after scaled in Flex?
In the Flash CS4, the movielip has x=40, y=700. In Flex, the swf is scaled 100% but when I get the x value of this movieclip, it's still 40. I try to get the scale ratio of x-axis by refering to swf's scaleX. But its 1, weird enough.
How can I get correct coordinates of movieclip?

I do try the localToGlobal but it seems its 1:1 ratio, the codes I use:
// swf is loaded by swfloader, there's a movieclip child named 'child_mc' in it, I want to locate its postion and size. It's top-left coordinates in flash cs4 is 4,740
var swf_obj:MovieClip = MovieClip(swf.content);
var mymc:MovieClip = swf_obj.child_mc;
child_before:Point = new Point(mymc.x, mymc.y);
child_after:Point = swf.localToGlobal(child_before);
Alert.show(
"before:"+child_before.x+","+child_before."y"+"\n"
+ "after:"+child_after.x+","+child_after."y"+"\n"
the dump result is:
before:4,740
after:4,740
dump screenshot is here: http://img198.imageshack.us/img198/2396/image2ew.png
I use values of child_after to draw green box. The white box is child_mc's actual position after scaled to fit canvas size (in turn the screen size). You can see they are far from each other. Why?
Do you mean I have to multiply the transform matrix myself to get the correct position?

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