context: function onToggleEnabled(event){    var item = event.target;    while (item && item.localName != "treeitem") {        item = item.parentNode;    }        var filterResource = rdf.GetUnicodeResource(item.id);    var filter = filterResource.GetDelegate("filter",                                            Components.interfaces.nsIMsgFilter);    filter.enabled = !filter.enabled;    refreshFilterList();}
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