Added Prepend() and Remove() methods to wxSizer,

Corrected a stupid bug in it,
  Freshed up wxPropertyXXX to make use of the icons
  in the dialogs.
  Made wxBmpButton inherit from wxButton. Grumble.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3394 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/button.h

@@ -57,7 +57,7 @@ class wxButton: public wxControl
            const wxSize& size = wxDefaultSize, long style = 0,
            const wxValidator& validator = wxDefaultValidator,
            const wxString& name = wxButtonNameStr);
-    void SetDefault();
+    virtual void SetDefault();
     void SetLabel( const wxString &label );
     bool Enable( bool enable );