@SubscribeEvent
    public void onBlockUpdate(BlockEvent.NeighborNotifyEvent event)
    {
        for (EnumFacing f : EnumFacing.VALUES)
        {
            BlockPos pos = event.getPos().offset(f);
            IBlockState state = event.getWorld().getBlockState(pos);
            if ((state.getBlock() == this) && (state.getValue(FACING) == event.getState().getValue(FACING)))
            {
                event.getWorld().setBlockState(pos, state.withProperty(OPEN, event.getState().getValue(OPEN)));
            }
        }
    }