anchor.diff:      super.onExit();
       disableInputs();
     }
  +  
  +  void enable(bool enable) {
  +    if (enable) {
  +      enableInputs();    
  +    }
  +    else {
  +      disableInputs();
  +    }
  +  }
   }
   
  
positive.code:       // TODO migrate to dirty method
        // Use the anchor to force the layer color back into center view.
        if (anchoredScene == null) {
          print("BackgroundLayer ${tag} : Warning! anchor not set. Background will not be constrained to fill scene.");
        }
        else {
          t.toIdentity();
  
negative.code:  * remains true.
   * This allows [BackgroundLayer] to act like a backdrop for your game/application.
   */
  abstract class BackgroundLayer extends LayerCascade with MouseInputMixin, KeyboardInputMixin, TouchInputMixin {
    
    // These functions are set according to the Render context type.
    // I wouldn't recommend this in general. It is only done in this
  