def treestore_to_xml_recursion(self, itr, xmlpath):
        while itr :
            f = self.treestore.get(itr, 0)[0]
            if f.__class__ == Feature :
                xmlpath.append(f.to_xml())
                
            # check for the childrens
            citer = self.treestore.iter_children(itr)
            while citer :
                p = self.treestore.get(citer, 0)[0]
                itm = p.get_attr('type')
                if (itm == 'items'):
                    pa = f.get_attr('path')
                    xmlpath_ = xmlpath.find(".//*[@path='%s']/param[@type='items']" % pa)
                    if xmlpath_ != None:
                        self.treestore_to_xml_recursion(self.treestore.iter_children(citer), xmlpath_)
                citer = self.treestore.iter_next(citer)

            # check for next items
            itr = self.treestore.iter_next(itr)