I hate to bust in but dignlivn's instructor is right. Other than on an aerobatic model throttle is supposed to control climb angle and elevator controls speed. This is the way it works in full sized aviation and with our trainers it's the same.... or rather it can be the same unless we trim this tendency out of the model using rearward CG locations, smaller decalage angles and downthrust. So really the instructor and you are both right but only from widely different perspectives.