Call wxTLW::SetDefaultItem() from wxButtonBase::SetDefault() instead of doing

it in wxButton implementations in (almost) all ports; changed its return type
to "wxWindow *" from "void" to accommodate the ports needing the old default
item (replaces part of patch 1696563)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45338 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/button.h

@@ -49,10 +49,9 @@ class WXDLLEXPORT wxButton: public wxButtonBase
                 ,const wxValidator& rValidator = wxDefaultValidator
                 ,const wxString&    rsName = wxButtonNameStr
                );
-    
+
     virtual ~wxButton();
 
-    virtual void     SetDefault(void);
     static wxSize    GetDefaultSize(void);
     virtual void     Command(wxCommandEvent& rEvent);
     virtual bool     OS2Command( WXUINT uParam