how can I load a New Level?

I've been trying to figure this out, but I can't.

How can I change a level when I collide with a certain object - for example, I unlock a door and when i go through the door, a new level loads.

I made the behavior below, but it's not working correctly.. It is loading the level, but it's loading it when right when the game starts. I want the level to load onCollision with the object.

if (!isObject(LevelChangerBehavior))
{
%template = new BehaviorTemplate(LevelChangerBehavior);
%template.friendlyName = "Change Level on Collision";
%template.behaviorType = "Game";
%template.description = "Changes to Level on Collision.";

%template.addBehaviorField(level, "Level to change (.t2d)", string, "");
}

function LevelChangerBehavior::onBehaviorAdd(%this)
{
%this.owner.collisionCallback = true;
}

function LevelChangerBehavior::onCollision(%this, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts)
{
%this.changeLevel();
}

function LevelChangerBehavior::changeLevel(%this)
{
sceneWindow2D.schedule(1,"loadLevel", "game/data/levels/" @ %this.level @ ".t2d");
}

thanks very much and God bless!