Need coordinate for particular tree node as currently expanded

Hi All,
i am working in flex for the past two months,currently i am
working on the drag and drop on a tree , where i am able to drag
one tree leaf node to another another tree leaf node and i am able
to draw a line between the two leaf node indicating that this has
been dragged from the previous tree of a particular node to the
current node of the tree.
The problem which i am facing is that when i collapse the
expanded tree , the line which i have drawn is not able to
synchronize with the tree expand or collapse (the line remains in
the same position even when the particular leaf node move down coz
of expansion of the above tree node.)
any help will be appreciated.

there is a private function in the tree.as class:
private function getVisibleChildrenCount(item:Object):int
that I can use by multiplying how many children there are by
how tall each item "physically" displays on the screen as, but I
want to get that publicly. I don't want to go about hacking the
tree.as code, that's poor form in the highest. Does anybody else
have any ideas...
please?

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          // when the Tree is empty.
          return this;
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    Regards
    Raheel

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