Classes containing underscores in name don't show up in Content Browser

Using underscores in class names (except as first letter of course) works fine when adding with UE4 class wizard, compiling and running in editor. However the classes are not shown in Content Browser (restarting UE4 didn’t help).

Nevermind, it was due to failing compilations. After the compilation succeeded and after restarting UE4 Editor, also those classes containing underscores in their name were shown in Content Browser.