added cmd line parsing support to wxApp and --theme option to wxUniv

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10952 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/widgets.cpp

@@ -192,6 +192,9 @@ END_EVENT_TABLE()
 
 bool WidgetsApp::OnInit()
 {
+    if ( !wxApp::OnInit() )
+        return FALSE;
+
     // the reason for having these ifdef's is that I often run two copies of
     // this sample side by side and it is useful to see which one is which
     wxString title;