@Override
	public boolean isMyGridChild(Room loc)
	{
		if(loc==null) return false;
		if(loc.getGridParent()==this) return true;
		if(loc.getGridParent()!=null) return false;
		try
		{
			for(final ThinGridEntry entry : rooms)
				if(loc == entry.room)
					return true;
		}catch(final Exception e){} // optimization
		return false;
	}