Improved wxFileDialog behaviour wrt to remembering filenames

Ported new scrolling code from wxWindow to wxScrollBar and
    wxSlider


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3780 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/filedlgg.h

@@ -166,6 +166,8 @@ public:
     void OnNew( wxCommandEvent &event );
     void OnChoice( wxCommandEvent &event );
     void OnTextEnter( wxCommandEvent &event );
+    
+    void HandleAction( const wxString &fn );
 
 protected:
     wxString       m_message;