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Link error in DHTML

I have problem when using this sample of xml data to load to dhtml tab

<?xml version="1.0"?>
<tabbar hrefmode="iframe">
<row>
<tab id="b1" width='130px' selected="1" href="channel.php?id_chan=230&key=100">All Employee List</tab>
<tab id="b2" width='100px'>Entry Form</tab>
<tab id="b3" width='110px'>Waiting Approval</tab>
<tab id="b4" width='110px'>List by Contract</tab>
<tab id="b5" width='110px'>List by Segment</tab>
    <tab id="b6" width='120px'>List by Job Function</tab>
<tab id="b7" width='170px'>Expired Employee History</tab>
</row>
</tabbar>

the error said, error in loading xml.... when i change the link for url to channel.php?id_chan=230, it works, but the new link cannot delivery the post method.
This case also happen when i use the xlm data with the similar link in the tree menu and the toolbar.

how can i fix this?

Please help me. thx.

Problem not in component, but in XML rules. XML deny  unescaped & char, the correct text will look as

<?xml version="1.0"?>
<tabbar hrefmode="iframe">
<row>
<tab id="b1" width='130px' selected="1" href="channel.php?id_chan=230&amp;key=100">All Employee List</tab>

&amp; will be automatically converted back to & in XML parsing process, so valid link will be used ( same rules need to be used with < and >  chars )