Just a quick note this time on a great way to introduce tabs into the product edit page in the Magento Admin panel: via the
> Observer. The full guide is posted on the custom tabs for magento product admin page on fishpig (a UK Magento Company). Just a quick fix that I found was proper to my case is that the actual createBlock statement can be done much simpler, as follows:
‘content’ => $block->getLayout()->createBlock(‘my_extension/adminhtml_catalog_product_edit_tab_label’)->toHtml(),
Notice that in simpler cases there is no need for second and third parameters. That is all, otherwise it worked flawlessly. Thank you fishpig!