Custom template for Magento 1.9 admin?

Question

PHP

There magentois a tab bar in the admin panel in the product editing section! And there is a tab Images
How to make it so that when you switch to the tab Images, a non-standard one is displayedtemplate

app/design/adminhtml/default/default/template/catalog/product/helper/gallery.phtml

, and my custom one?
Tried to do this but didn't work :(

Answer 1

Should be like this

<adminhtml>
                    <rewrite>
                        <catalog_product_helper_form_gallery_content>
                            HB_ProductMedia_Block_Adminhtml_Catalog_Product_Helper_Form_Gallery_Content
                        </catalog_product_helper_form_gallery_content>
                    </rewrite>
                </adminhtml>