Many people do not want to touch C++ to make the PC version of their objective-C extension for iOS.
So here is a iOS Dummy Control extension where you simply fill out the JSON and change the icon file.
Remember to name all the files exactly the same and change the extension identifier in the JSON.
You can resize it at edit-time where it will show the extension icon over a transparent grey background.
It will always be on top to mimic a window control.
I will try to write up a guide for non-clickers that work on iOS extensions soon.