code: function setChildRowVisibility(parent, flag) {
  	parent.visit(function(node){
  		var tr = node.tr;
  		// currentFlag = node.hide ? false : flag; // fix for ext-filter
  		if(tr){
  			tr.style.display = (node.hide || !flag) ? "none" : "";
  		}
  		if(!node.expanded){
  			return "skip";
  		}
  	});
  }
docs: /* Show/hide all rows that are structural descendants of `parent`.