The ItemBlock for this block (registered properly)

ItemStainedFragileGlass

public class ItemStainedFragileGlass extends ItemBlockWithMetadata
{
    public ItemStainedFragileGlass(Block b1)
    {
        super(b1, b1);
    }

    @Override
    public String getUnlocalizedName(ItemStack itemstack) {
        return this.getUnlocalizedName() + "." + ItemDye.field_150921_b[itemstack.getItemDamage()];
    }

    @SideOnly(Side.CLIENT)
    @Override
    public IIcon getIconFromDamage(int damage)
    {
        return this.field_150939_a.getIcon(2, damage);
    }
}