#include "wx/fontenum.h"
 #include "wx/artprov.h"
 #include "wx/spinctrl.h"
-#include "wx/app.h"
 
 IMPLEMENT_DYNAMIC_CLASS(wxHtmlHelpFrame, wxFrame)
 
 }
 #endif
 
-// we don't want to prevent the app from closing just because a help window
-// remains opened
-bool wxHtmlHelpFrame::ShouldPreventAppExit() const
-{
-    return (wx_const_cast(wxHtmlHelpFrame*, this) == wxTheApp->GetTopWindow());
-}
-
 #endif // wxUSE_WXHTML_HELP