3
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
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<window orient="vertical" style="border: 2px solid green"
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xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
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function collapseTag(id)
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var row = window.document.getElementById(id);
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row.setAttribute("collapsed","true");
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function uncollapseTag(id)
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var row = window.document.getElementById(id);
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row.setAttribute("collapsed","false");
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<grid style="border: 2px solid red;" id="grid">
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<columns id="columns1">
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<column id="column1"/>
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<column id="column2"/>
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<column id="column3"/>
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<rows id="rows1" style="font-size: 24pt">
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<button label="collapse row 2" oncommand="collapseTag('row2');"/>
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<button label="uncollapse row 2" oncommand="uncollapseTag('row2');"/>
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<button label="collapse column 2" oncommand="collapseTag('column2');"/>
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<button label="uncollapse column 2" oncommand="uncollapseTag('column2');"/>