Buttons "Add Part" and "Add Modifier" (in the Object Settings) works now

xs/src/slic3r/GUI/GUI_ObjectParts.hpp

@@ -5,6 +5,11 @@ namespace Slic3r
 {
 namespace GUI
 {
+bool is_parts_changed();
+bool is_part_settings_changed();
+
+void load_part(	wxWindow* parent, ModelObject* model_object, 
+				wxArrayString& part_names, bool is_modifier); 
 void on_btn_load(wxWindow* parent, bool is_modifier = false);
 void parts_changed();		
 } //namespace GUI