Fixed a problem with borders being set wrong sometimes on wxMSW, XP, VC++ 7

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18355 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/listbox.cpp

@@ -161,6 +161,10 @@ bool wxListBox::Create(wxWindow *parent,
 
     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
                   _T("only one of listbox selection modes can be specified") );
+
+    if ( (m_windowStyle & wxBORDER_MASK) == wxBORDER_DEFAULT )
+        m_windowStyle |= wxBORDER_SUNKEN;
+
     if ( m_windowStyle & wxCLIP_SIBLINGS )
         wstyle |= WS_CLIPSIBLINGS;