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attached tree into layout

Hi, i have a little problem triying to get 'myTree.getSelectedItemId()', in fact i can't reach 'myTree' object,....so the code is like this...

index.php:
...
var myLayout;
myLayout = new ....... ( a layout with two panels, one for a tree an another for a form )
...
myLayout.cells("a").attachURL("tree.php");
myLayout.cells("b").attachURL("form.php");
...

tree.php:
...
var myLayout = parent.myLayout; <-- i get rid of the layout objet by this way, it works fine!
var myTree = new .... (a tree object)
...
myLayout.cells("a").attachTree("0"); <- i've done this way because i want the scrollbars over the panel

form.php
...
var myLayout = parent.myLayout;
...

so, how i get rid of the tree attached object in here??

i've tryed:

var myTree = myLayout.myTree => undefined
var myTree = myLayout.cells("a").myTree => undefined
var myTree = myLayout.cells("a").document.myTree => document is undefined

i've checked that all variables my* are at the correct scope ( i mean not inside a JS function or whatever), because the code is not 'exactly' this same it is not posible to pass the node id trougth the URL when calling the form.

and finally, just for contribute, this rare implementation ( attaching an URL into a pane and then attahcing a tree to a pane ) is because if you dont do it like this way:

if the tree heigth exceds the panel heigth the scrollbar appears on the panel, BUT if the tree width exceds the panel width the scrollbars appears on the tree.. so it means if the tree exceds both, you should scroll the panel all the way down to see the horizontal scrollbar.

hope i've explained it clear

ok, i'll try this, im sure it will work.

i didnt thougth it was into a iFrame 'cause Firefox doesnt shows the "this frame" option in the contextual menu.. i'll try Firebug to see if it shows me the really runtime DOM

by the way.. it (the missing "this frame" option) only happen over panels with attached objects trougth "myPane.cells(...).attach<Class>(...);"

the "._frame.contentWindow" approach didn't work

i have take a deep look into my code and it is logic, this is NOT a bug or something (if you want a full -very long- explanation just ask me for it)

in fact, my problem are the scrollbars, there is a way to set trees to dont show any scrollbar and let panels/cells do it for them?