‘simple_edit_form’ action hook not working?

I am developing a plugin for wordpress that requires additional form fields to be added to the Simple Edit Post Form. The following is some example code.

function myFunction(){
echo(“Hello World”);
}

add_action(‘simple_edit_form’,’myFunction’);

Now, when I click ‘Write’ in the wordpress administration section, I do see “Hello World” printed below the default Simple Edit Post Form. However, when I click ‘Manage’, then click ‘Edit’ for a given post, my plugin does not output “Hello World” below the Simple Edit Form. Why? My plugin only seems to be called when creating a new post, not when editing an existing post. Is this a feature or a bug? Or is there something in the above code that is not correct? Any and all help is greatly appreciated!