The most rewarding approach for trainers and bird alike is to encourage the bird to learn the desired behavior using positive reinforcement. Dominance has very little use in bird training. Training a desirable bird behavior is a bit more difficult than just giving a bird a treat when it does something right. There are some key elements that are important in training new behaviors. The first principle of training is to interpret the motivation for an action.
Every action has motivation based on gaining pleasure or avoiding pain.
Most everything birds do is linked to gaining pleasure or avoiding pain. Understanding the motivation will give you the clues necessary to help you shape your birds' behavior. Much of the behavior we see in pet parrots is driven by instincts. A parrot hatched in captivity still has instincts important to its survival in the wild. Positive reinforcement is anything that occurs in conjunction with an act that tends to increase the likelihood that the act will occur again.