Extending the MySQLi_Result object?

Hi there, It's my first post here, so go gentle. I have run into a problem when trying to extend the MySQLi_result object because the MySQLi object's method "query" always returns a MySQLi_result and, to my knowledge, it is impossible to make it do otherwise. So, my question is, how do I alter the "query" method to return my new MySQLi_result object instead of the base object? Or, is there another/better way of achieving what I'm looking for? Am I missing something very obvious here? :) Thanks, Joe Bandenburg