AS2 class attachMovie

The name of my .fla file is round.fla. In round.fla, I have a movieClip called "collisionToolTip" and the identifier is also named the same. Export for ActionScript and Export in first Frame are both checked.

Originally, the code was a function in the main .fla. I am now updating to use an external class instead. Everything was working before, but the movieClip is not appearing now. I know the syntax needs to be tweaked, but I am not sure what is needed for the attachMovie code.

import flash.geom.Rectangle;
// for collision detection
import com.gskinner.sprites.CollisionDetection;
//
class com.wfc.CollisionHandling extends MovieClip {
  private var myTextCollisions:Number = 0;
	
  function CollisionHandling() {
  }
	
  public function checkCollision(mc1, mc2, alphaAmount) {
    var collisionRect:Rectangle = CollisionDetection.checkForCollision(mc1, mc2, alphaAmount);

    if (collisionRect) {
      myTextCollisions = myTextCollisions + 1;
      _root.attachMovie("collisionToolTip","collisionToolTip",100,{_x:(25), _y:(75)});
    } else {
      _root.removeMovieClip(collisionToolTip);
    }  
  }
}

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