From 09ccad0b656e56537e9d3292fcafa997e166f342 Mon Sep 17 00:00:00 2001
From: "Chaobin, Zhang" <zhchbin@gmail.com>
Date: Wed, 10 Sep 2014 08:54:07 +0000
Subject: [PATCH] Only register window message "TaskbarButtonCreated" when the
 first frame is created.

Author: Chaobin Zhang

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77577 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/frame.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/msw/frame.cpp b/src/msw/frame.cpp
index 491f749e47..06816c73da 100644
--- a/src/msw/frame.cpp
+++ b/src/msw/frame.cpp
@@ -144,8 +144,13 @@ bool wxFrame::Create(wxWindow *parent,
 
 #if wxUSE_TASKBARBUTTON
     m_taskBarButton = NULL;
-    gs_msgTaskbarButtonCreated =
-        ::RegisterWindowMessage(wxT("TaskbarButtonCreated"));
+    static bool s_registered = false;
+    if ( !s_registered )
+    {
+        gs_msgTaskbarButtonCreated =
+            ::RegisterWindowMessage(wxT("TaskbarButtonCreated"));
+        s_registered = true;
+    }
 #endif
 
     return true;