When you minimize to the tray icon it says "I'm down here," down being the operative word. Don't assume the task bar is at the bottom. Mine is at the top, but it could be on the side, too. Refer to it saying, "I'm here." The balloon will do the rest.
Also, when you activate using the menu, the Buy Now button doesn't go away. You have to run the program again after completely shutting it down. A simple ShowWindow (SW_HIDE) for the button will remedy this.