Most training courses are garbage and most certifications are worse than useless, at least here in the States.
Most people I know who are in positions where they interview and hire will actually see a number of certifications on a resume for a software engineer and put them on the bottom of the pile. Any idiot can memorize the answer, thats not what employers are looking for. They either want somebody who has worthwhile experience and can demonstrate and articulate knowledge and experience, or an entry-level who is really bright, open-minded and can quickly pick up on new things.
It has been my experience in interviewing as well that most (there were a few exceptions...) software engineers I have met that had a list of certifications were embarassingly bad.
Training at worst would be a waste of time and money but a certification might actually hurt your chances of finding a job. If I were you I would convince your boss to spend this money on books, reference manuals and give you a few extra hours a week to experiment and play with new technologies. You will be happier learning new skills and your boss will likely be happier spending considerably less.