I'm working on migrating one of my plugins to 2.5. Previously, I'd have a function that constructed a form that was to be presented on the write/edit pages, and add it with:
In 2.5, that isn't working. I've read the Admin Screens section of the Migrating Plugins page and see the new function add_meta_box and the reference to check it out in template.php. But I still don't understand what I need to get it to work in 2.5.
Would someone be able to provide me with a simple plugin to display 'Hello World' with the new add_meta_box function?