--- a/MainWindow.hpp	Sat Nov 01 20:57:17 2008 +0100
+++ b/MainWindow.hpp	Sun Apr 24 14:03:52 2011 +0200
@@ -4,10 +4,16 @@
 #include <wx/wx.h>
 #include "CropArea.hpp"
 
+DECLARE_EVENT_TYPE(EVT_NEXTPICTURE, -1)
+
 class MainWindow : public wxFrame
 {
 public:
     MainWindow(const wxImage &img, CropArea area, wxSize size);
+
+    void OnNextPicture(wxCommandEvent &e);
+
+    DECLARE_EVENT_TABLE ();
 };
 
 #endif /* _HEADER_MAINWINDOW_HPP_ */