Must be a specific UI different than Custom UI
In any case that take the original names files existing! )

I see you don't have the same name as your file: ExtendEdgeSelection.js, on the drop-down menu I read: Extend Edge Selection!??

Hi Zooen,

The screenshot is taken when I had problem running the script. After MO's suggestion on changing the .js file's name; things started to work as they supposed to.
It means if I send u a new screenshot there u will see "ExtendEdgeSelection" instead of "Extend Edge Selection"

And I congratulate you; it seems you have keen eyes! ;-)

- Psygorn