tree.getIconClass = function (item,/*Boolean*/ opened) {
  var type = item.type.toLowerCase();
  if (type === "folder") {
	return opened ? "dijitFolderOpened" : "dijitFolderClosed";
  } else {
	// Lots of modules are marked as type undefined,for which we have no icon,so use object instead.
	// TODO: we also have no icon for instance,so use object icon.
	if (/undefined|instance/.test(type)) {
		type = "object";
	}
	return "icon16 " + type + "Icon16";
  }
}

.stringIcon,.stringIcon16{ background-image:url('icons/16x16/string.png'); }

.icon16{ width: 16px; height: 16px; }