Why i must click on the stage to initialize key event?

hey, i created a game with 2 frames:
1 is the welcome screen + player name input text box.
the other is the game itself.

at first the game didn’t have the welcome screen, and if i wanted to play (with the arrows keys) there was no problem to type one of the arrows and make the player move…

since i added the first frame, in order to play i must click somewhere on the stage and only then i can press the arrows keys… before clicking nothins happens!

it is important to mention that it happens in the flash player ( i didn’t check what happens in web browsers…)

how can i set the focus of the game in the second frame?

tnx a lot!