Recognizing key presses without a mouse click

My program beings with a frame with a "play" button on it. Once he "play" button is clicked the user is taken to the second frame to play a game. Control for the game is done via key presses. The control works well; I'm able to move the sprites and so forth. However, my problem is after the user clicks "play" and is taken to the second frame the game will not recognize key presses until the user has clicked the applet again. How do I get the game to recognize key presses automatically after the user has clicked "play"?

Here is the code I use in the second frame to listen for key presses: