horizontal list x,y-coordinates for data objects

hello again,

a component of mine looks this:
<mx:canvas>
<mx:hbox>
<mx:horizontallist />
<mx:tilelist />
</mx:hbox>
</mx:canvas>

now, question this... horizontal list contains, data
provider, array collection of objects (which
average icon label). pretty straightforward enough. however,
what need locate x- , y- coordinates of *each* of
these objects because need draw lines (think of map...)

i not sure start... thinking of using
something function localtoglobal() think way
coded makes not feasible... or i'm using wrong things...

please please please... appreciated! :)

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