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is it possible to add a button to a subtab? I would like to add one to the item subtab.

```    function beforeLoad(context) {
        var f = context.form;
        var itemlist = f.getSublist("item");
        itemlist.addButton({id:'custpage_itembutton', label: 'My Item Button'});
        return true;
    }```

That adds a button to the sublist, not the tab itself though, right?

I do think that is the only supported option, though.

I have seen buttons on subtabs, although I haven't tried. Someone here, earlier told, they are moved to subtab using DOM manipulation.
Let me know how you do that.