TextBox and Keyboard Focus Help

I'm writing a program (http://www.evglabs.com/visual-plotter) and I made a shortcut that ends up focusing a TextBox, but I can't make another shortcut to "close out" of the TextBox because keyboard events don't seem to register when a TextBox has focus.

Has anyone else ever come up against this? Is there a fix?

I'd like to make this work so the use wouldn't have to keep jumping between keyboard, mouse, keyboard, mouse, etc.

Thanks