How to add "Specials" menu to UV Maps?

Can some one help with this?

what did you mean by the special menu you can add more functionality by the enabling add-ons (or download some external and add in blender) so your UV editor starts showing more options in the header and side panel bar

This is what my current UV special menu looks like:
BUT I had to replace existing blender class with the same name and add to it my code.

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