class FilePickerCtrl;
class LanguageTagWidget;
+class RegionSubtagWidget;
class wxDirPickerCtrl;
class wxSpinCtrl;
class wxSpinCtrlDouble;
extern void checked_set (wxStaticText* widget, wxString value);
extern void checked_set(LanguageTagWidget* widget, dcp::LanguageTag value);
extern void checked_set(LanguageTagWidget* widget, boost::optional<dcp::LanguageTag> value);
+extern void checked_set(RegionSubtagWidget* widget, boost::optional<dcp::LanguageTag::RegionSubtag> value);
extern int wx_get (wxChoice* widget);
extern int wx_get (wxSpinCtrl* widget);