Hold down the Shift key and press the Tab key.
Just kidding. Your question isn't clear enough to give an answer. When you say "manually set the focus using VB" I assume you mean you're calling the SetFocus method, but you can use that to focus any control, so asking how to go backward doesn't seem to make sense.
It could be that you "manually set the focus using VB" by using SendKeys to send a {Tab} keystroke, but I hope you didn't. SendKeys should only be used as a last resort, because you can't be certain that the keystroke will go where you meant it to. It could even be read by another application entirely--I've had it happen--and that could be disastrous for your user. You should definitely be using SetFocus.
Rick Sprague
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To write a program from scratch, first create the universe. - Paraphrased from Albert Einstein