Trouble with C# book’s chapter 4 exercise titled "Building a Typing Game"

I went through this chapter 4 (page 160) exercise in Head First C# 2 times and yet the form did not respond to my key strokes. I am not sure what I missed however I did note that the keydown event developed in the exercise was on the form and not the listbox1. I created a keydown event for the listbox and put a messagebox in it which showed me that the keystrokes were captured every time inside that control. How is it that your exercise was expecting the form’s keydown event to fire when the focus is on the listbox? Maybe I missed something. Thanks in advance for an answer.