// Destroys the box by removing it from the field and from the game field
public override void Destroy()
{
underThis.RemoveMoveable();
GameField.GetInstance().RemoveBox(this);
}
// ReMoves the worker from the control interface
// and signals this action to the game field
public void RemoveWorker()
{
worker = null;
GameField.GetInstance().OutOfWorkers();
}