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trackable1.enabled in own function

Hello!

I've got an problem by setting a tracker to invisible in my own function.

When I click the change button I call "clickedChange":

clickedChange: function() {
        
        //alert("fire");
        trackable1.enabled = false;
        trackable2.enabled = true;

}

 

But I always geht the error: "trackable1 is undefined".
Even when I use "World.trackable1.enabled.

How can I set the state of the trackable in my own function?

I would be very pleased for a hint in the right direction :)

 

best regards