I want to add tabs to a custom form in the backend. There are a couple of great tutorials how to add tabs, like from Inchoo [http://inchoo.net/magento/magento-grid-serializer-ajax-grids/] or Erfan Imani [https://erfanimani.com/intro-to-magento-adminhtml-layout-blocks/]. But I wanted this: And got this: The problem is simple -