The best way is to start seeing managers as partners in the training process. Training is a process, not an event. And managers, participants and trainers alike have a great deal of impact on whether any kind of training is implemented. If managers see that what is being offered to their employees is equipping them to perform faster, better, easier -- they'll support training and other solutions that you recommend. Make sure you involve managers in both the needs assessment and evaluation processes and consider creating an advisory board of managers that can lend expertise and credibility to your efforts.