Don't lose sleep. I figured out what it was used for quickly but don't like having to ask, "Why does this variable exist?" when reading code.
I don't remember the exact situation, but I can build an analogy. Component A had a border thickness, and you wanted component B to have a thickness slightly smaller than that one. This is how ReverBoarder was used:
The name was probably meant to evoke "RevertBorder", but even in that role it's silly. There was no need for a temporary variable:
Dim ReverBoarder As Integer = A.BorderThickness
A.BorderThickness = A.BorderThickness - 3
B.BorderThickness = A.BorderThickness
A.BorderThickness = ReverBoarder
I'm still deciding if I want to work on this and how I want to approach it; time is short and it's a pretty big undertaking. It's not that I don't want to work on it, it's that it's hard to find the time. I get about 2 hours of good free time daily and that makes it pretty precious to me. A problem with getting motivated is I don't really understand the end goal of this control; what's that blank space in the middle contain? I can't click on many things; is that intended? I don't like fiddling with code if I don't understand how it's supposed to work in the end.
B.BorderThickness = A.BorderThickness - 3