Test3

    @Override
    public void registerIcons(IIconRegister register)
    {
        if(!itemStack.hasTagCompound())
        {
            itemStack.setTagCompound(new NBTTagCompound());
        }

        if(itemStack.getTagCompound().getByte("Mode") == 0)
        {
            itemIcon = register.registerIcon("wolf_addons:redstone_sword_off");
        }
        else
        {
            itemIcon = register.registerIcon("wolf_addons:redstone_sword_on");
        }
    }