From 47047a608adb74e7190de5f6d4168074135e5cdb Mon Sep 17 00:00:00 2001
From: Maarten Bent <MaartenBent@users.noreply.github.com>
Date: Wed, 10 Mar 2021 23:46:50 +0100
Subject: [PATCH] Fix drawing undetermined state of owner-drawn checkbox

---
 src/msw/checkbox.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/msw/checkbox.cpp b/src/msw/checkbox.cpp
index d489201848..ac2784da74 100644
--- a/src/msw/checkbox.cpp
+++ b/src/msw/checkbox.cpp
@@ -247,11 +247,11 @@ int wxCheckBox::MSWGetButtonCheckedFlag() const
             return wxCONTROL_CHECKED;
 
         case wxCHK_UNDETERMINED:
-            return wxCONTROL_PRESSED;
+            return wxCONTROL_UNDETERMINED;
 
         case wxCHK_UNCHECKED:
             // no extra styles needed
-            return 0;
+            return wxCONTROL_NONE;
     }
 
     wxFAIL_MSG( wxT("unexpected Get3StateValue() return value") );