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<?xml version="1.0"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
xmlns:html="http://www.w3.org/1999/xhtml"
onload="run()">
<tree id="tr" flex="1">
<treecols>
<treecol/>
</treecols>
<treechildren>
<html:optgroup id="group">
<html:option id="victim" label="never see this"/>
</html:optgroup>
</treechildren>
</tree>
<script type="text/javascript"><![CDATA[
function run() {
group = document.getElementById("group");
tc = document.createElement("treechildren");
group.appendChild(tc);
v = document.getElementById("victim");
v.parentNode.removeChild(v);
v = null;
tree = document.getElementById("tr");
col = tree.columns[0];
alert(tree.view.getItemAtIndex(1, col));
}
]]></script>
</window>
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