Turning a light on and off

Hi all. I've come across a problem when I try to toggle my light on and off, I was using:

function volumeLight::enable(%this)
{
   %this.setEnable(true);
   %this.setScale(%this.getScale());
}

and,

function volumeLight::disable(%this)
{
   %this.setEnable(false);
   %this.setScale(%this.getScale());
}

To toggle my lights on and off.

As a test, I drop the swinging light from starter.fps kit into the world, gave it a name, and toggled it on and off a few times to make sure it worked. Everything worked great until I saved the mission, quit, and came back in. Now the lights won't turn on and off! The only way for me to toggle a light, is to create a new one ever time I load the mission.

Is there something I'm missing? Is there a better way to toggle a light?
Please help!