@Cara Bereck Levy-
I've posted a couple of times about migrating from Vision to UniStream and have been able to substitute missing functions so far after a bit of digging each time. My answers are usually found in the downloadable "UniLogic_Example_Projects".
It just so happens that there's a directory in the extracted files called (of all things) "UDFBs". Where I found most of my answers.
For those who haven't seen it's contents-
So my question is this - why does the default UniLogic installation have a totally empty Library?
These files aren't large. I humbly suggest that this collection be added to the UniLogic installation in the UniLogic/Library/Ladder install directory.