Making a line's coordinates adjust to a Dynamic/Scrolling Canvas

Hi,
I am trying to use Flex to develop a simple display... I have a canvas
with couple of Buttons. I draw line between some of these buttons. As long as
there is no scroll on the screen the line show up fine. But once width/Height 
of the Canvas increases and you get the scroll... the lines don't scroll
accordingly. The lines appear to be sticky on the Canvas rather than
move with the buttons...
Any idea how I can overcome this???

Once i draw the line i add it as a child to the canvas. But when the size of the canvas changes, the line seems like it sticks to the canvas while the other components of the canvas adjust well.

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