Adding Properties to a Physics Volume?

Currently I am trying to add a few new properties to a physics volume via C++, but when I add a new UProperty to it in Visual studio it doesn’t change anything in the editor.
We are trying to go for a weather system just like hourences did in Solus as seen here:

But nothing seems to work or fails to compile.
Is there a easy way to add properties to volumes that I am just missing?