I Need Help On Rpg Maker Xp!!!

I need help on rpg maker xp. I'll make this short and sweet. Ok, I'm trying to make a room for a dungeon. And I want it to be full of switches, but all of them fake, except for three. And when you find the 3 switches, a chest appears with a door key in it. And also, you can't get out of the room until you find the switches. If possible, just how do you do that???