#endif
class FilePickerCtrl;
+class wxDirPickerCtrl;
class wxSpinCtrl;
class wxSpinCtrlDouble;
class wxGridBagSizer;
extern double calculate_mark_interval (double start);
extern void checked_set (FilePickerCtrl* widget, boost::filesystem::path value);
+extern void checked_set (wxDirPickerCtrl* widget, boost::filesystem::path value);
extern void checked_set (wxSpinCtrl* widget, int value);
extern void checked_set (wxSpinCtrlDouble* widget, double value);
extern void checked_set (wxChoice* widget, int value);