Doors, look for them, I know there's like 3 tutorials or at least topics asking the same thing.
There are Tutorials for them, but this is the one i use, i kinda stumbled upon it myself...copy and pasted the wrong thing...it was like a miracle! I thought i was amazing...then i found the Tutorials...if i could remember who had the same thing as i do, i'd give him/her credit...
Place a event where you want your Door. Get a door graphic that you want. Then set it to action trigger(you could do hero tough, but i like having to manual open it, so i don't go into a place i don't want to). Now this is where you put a command, a move command actually, make it for 'This Event'.
face left
wait:4 frames
face right
wait:4 frames
face up
Wait for complation
Place your Teleport command and where your door leds to and your done. Now it should work and it should look as if a door is opening.