tons of fixes for wxGTK/Univ - seems to work, more or less, now

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10805 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/combobox.cpp

@@ -24,6 +24,8 @@
     #pragma hdrstop
 #endif
 
+#if wxUSE_COMBOBOX
+
 // for all others, include the necessary headers
 #ifndef WX_PRECOMP
     #include "wx/log.h"
@@ -492,3 +494,5 @@ void ComboboxWidgetsPage::OnCheckOrRadioBox(wxCommandEvent& event)
     CreateCombo();
 }
 
+#endif //wxUSE_COMBOBOX
+