code: public boolean onScrollWheel(int delta)
  	{
  		if (!isEnabled())
  			return false;
  
  		for (IControlComponent c : controlComponents)
  			if (c.onScrollWheel(delta))
  				return true;
  
  		return parent != null && !(this instanceof IControlComponent) ? parent.onScrollWheel(delta) : false;
  	}
docs: On scroll wheel.
  
  @param delta the delta
  @return true, if successful