[Bug 41364] New: Can't access preferences box in Reaper, when using Gtk3 theming

https://bugs.winehq.org/show_bug.cgi?id=41364

Bug ID: 41364
           Summary: Can't access preferences box in Reaper, when using
                    Gtk3 theming
           Product: Wine-staging
           Version: 1.9.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail]
      Distribution: ---

Created attachment 55714
  --> https://bugs.winehq.org/attachment.cgi?id=55714
wine-staging-gtk3_theming-reaper_no_preferences

I decided to test out gtk3 theming in Staging, to see how it was progressing.
While for the most part it seems to be working fairly well, yes i know that it
isn't completed yet...Anyway, I ran into a bug;

wine --version = wine-1.9.19 (Staging)
Archlinux 64bit = uname -a 4.6.7-rt11-2-rt #1 SMP PREEMPT RT Wed Sep 14
00:12:44 EDT 2016 x86_64 GNU/Linux
Gnome: 3.20.x GTK3 version; 3.20.9

I'm running the 64bit version of Reaper, but it should matter to reveal the
issue. In Reaper, I am not able to access any of the settings in the
preferences dialog, using gtk3 theming;

wine-staging 1.9.19 (uxtheme, working); http://funkyimg.com/view/2gZ8M

wine-staging 1.9.19 (uxthemegtk, missing preferences);
http://funkyimg.com/view/2gZ8N

Reaper 64bit - exe/download;
http://www.reaper.fm/files/5.x/reaper524_x64-install.exe

terminal ouptut; http://pastebin.com/NhmZ9zER
(and also attached as a text file)

Obviously, I can just not use gtk3 theming to avoid this issue. but I thought I
would point it out, since gtk3 theming is being worked on in this branch.

If any other information needs to be provided, please let me know. Thanks!