Using arrow keys in Visual Basic code?

I have a group of textboxes for a tab editor. 6 vertcle, 25 horizonal. ( numeric guitar sheet music) I want to be able to navigate them with the arrow keys. If I number them in chronological order from the bottm left, the up arrow key would be "+1", down arrow key "-1", the left key "-6", & the right arrow key "+6". That way I can navigate any possible way on the array. My question is, "How do I do this in code?". ( I have never had a school coarse of any kind in programming-learning. I'm learning Visual Basic Express at home. It ties in with a chord finder & a scale finder, which display on a fretboard. All that is working.)

(I'm building this at home for guitar teaching friends.)

Thanx in advance to all who can help.