//item constructor

public ItemVariant(String registry, int variants, CreativeTabs tab) {
        super();

        this.tab = tab;
        this.registry = registry;
        this.variants = variants;
        setCreativeTab(tab);
        setRegistryName(registry);
        setHasSubtypes(true);
    }

// item initialization in commonproxy

r.registerAll(
                new ItemVariant("tungsten_component", 3, Exkva.tabComponents),
                new ItemVariant("titanium_component", 3, Exkva.tabComponents),
                new ItemVariant("aluminum_component", 12, Exkva.tabComponents),
                new ItemVariant("silver_component", 4, Exkva.tabComponents),
                new ItemVariant("iron_component", 8, Exkva.tabComponents),
                new ItemVariant("copper_component", 7, Exkva.tabComponents),
                new ItemVariant("tin_component", 6, Exkva.tabComponents),

                new ItemVariant("circuit", 4, Exkva.tabComponents)
        );

all items appear in every creative tab, even though they are only assigned to one