[Bug 6447] New: VAZ Modular module window close causes error message box

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6447

Summary: VAZ Modular module window close causes error message box
           Product: Wine
           Version: 0.9.23.
          Platform: PC
               URL: http://www.software-technology.com
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-comctl32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Whenever a module window is closed (modules are built up to make a synth),
message box appears saying "Cannot focus a disabled or invisible window"

When shutting down the program, for a big modular synth bank, that's around 100
or more message boxes appearing, each of which must be clicked "Ok" to continue.