attempt to fix linking error in one of the tinderbox builds by moving local class declaration out of the function

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43016 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dialogs/dialogs.cpp

@@ -1224,8 +1224,7 @@ void MyFrame::ShowFullAboutDialog(wxCommandEvent& WXUNUSED(event))
     wxAboutBox(info);
 }
 
-void MyFrame::ShowCustomAboutDialog(wxCommandEvent& WXUNUSED(event))
-{
+// a trivial example of a custom dialog class
 class MyAboutDialog : public wxGenericAboutDialog
 {
 public:
@@ -1243,6 +1242,8 @@ void MyFrame::ShowCustomAboutDialog(wxCommandEvent& WXUNUSED(event))
     }
 };
 
+void MyFrame::ShowCustomAboutDialog(wxCommandEvent& WXUNUSED(event))
+{
     wxAboutDialogInfo info;
     InitAboutInfoAll(info);