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dhtmlxtree FF reload problem

Hello

I have a problem with dhtmlxtree in firefox.

The tree are buil in one page and the page are included in an iframe.

when i load the page i get those error:

Error type: LoadXML
Description: Incorrect XML

but the tree are loaded correctly in iframe.

In IE work fine.

Is a firefox iframe problem?

Actually the loading page in iframe must not change behavior of code ( iframe is a new window instance, so from components perspective , it is the same as loading from main window  )
It possible that because of some path problems components loading incorrect data in problematic case, please try to use debug version of dhtmlxcommon.js and check which file and with which content loaded in problematic case. 
http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&q=2545&ssr=yes&s=dhtmlxcommon

Ok,

with the debug version of common.js the problem is that in FF the xml is loaded 2 time, in IE no.

The first time xml is ok but the xml error occurs, the second time is all ok

Xml result:
<?xml version="1.0" encoding="iso-8859-1"?><tree id="0"><item text="&#160;F16Viper (C1)" child="3" id="DXAnaCasa.1" im0="tree/admin/ico_casa.gif" im1="tree/admin/ico_casa.gif" im2="tree/admin/ico_casa.gif"><userdata name="url">casa.php?azione=show&amp;casaID=1</userdata></item><item text="&#160;Raptor (C3)" child="178" id="DXAnaCasa.3" im0="tree/admin/ico_casa.gif" im1="tree/admin/ico_casa.gif" im2="tree/admin/ico_casa.gif"><userdata name="url">casa.php?azione=show&amp;casaID=3</userdata></item></tree>

The component can't initiate data loading on its own, so situation with double calls must be caused by some specific code used in tree's initializaton.
Please provide a code  snippet or any kind of sample where issue can be reconstructed ( you can send it directly to support@dhtmlx.com )