Missing button

I’ve been trying to learn how to use Flash but ran into a little problem. I was going over a tutorial when it instructed me to click on the oval button. All I have in my “Tool” window is the rectangle button. Here goes a preview of what I’m talking about.

I’ve been going through the preferences but can’t find anything on the oval or circular button. I’m running on XP SP2, Flash CS3 Prof. latest updates.

Thank you,