Completely stuck...

[Elpizo]

All went well while playing FF VI.

Until Kefka's tower... I divided my characters into three groups, folowed teh walkthrough precicely. Yet, after I defeated teh last Dragon, and examined the chest with the red sparkle on, I'm stuck.

Group2 and 3 stand on the switches to open that big Iron door, but I'm completely stuck with G1 at the dead end. It was supposed to be open after examining the chest with teh sparkle, but nope, I'm still stuck.

What did I do wrong or should I do now?
I tried to find otehr ways, but I just can't seem to figure out what to do...

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EDIT: never mind, I played the whole dungeon again and after some searching I found a way. Good thing I have 99 tents...