I have a feeling you can drop an icon from one vi onto the icon of another vi and it imports it, so there might be a quick way there to recover the missing icon info. Maybe worth a look (I'm not able to test this right now).
That approach copies the entire icon, which gets you the body of the parent method VI icon, but also the banner of the parent class icon, which you don't want on the child method VI.
can you copy just a single layer in the icon editor and then paste that?
Yes you can. I've done this quite a bit.
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