-extern wxStaticText* add_label_to_sizer (wxSizer *, wxWindow *, wxString, int prop = 0);
-extern wxStaticText* add_label_to_grid_bag_sizer (wxGridBagSizer *, wxWindow *, wxString, wxGBPosition, wxGBSpan span = wxDefaultSpan);
+extern wxStaticText* add_label_to_sizer (wxSizer *, wxWindow *, wxString, bool left, int prop = 0);
+extern wxStaticText* add_label_to_grid_bag_sizer (wxGridBagSizer *, wxWindow *, wxString, bool, wxGBPosition, wxGBSpan span = wxDefaultSpan);