diff --git a/Gtkmm3_Mac/src/ui/MyDock.cc b/Gtkmm3_Mac/src/ui/MyDock.cc
index b2c655b..9cc98a9 100644
--- a/Gtkmm3_Mac/src/ui/MyDock.cc
+++ b/Gtkmm3_Mac/src/ui/MyDock.cc
@@ -58,6 +58,7 @@ MyDock::MyDock(BaseObjectType *cobject, const Glib::RefPtr<Gtk::Builder> &ref_Gl
     btndraw->signal_clicked().connect(sigc::mem_fun(*this, &MyDock::btndraw_clicked));
     paddraw->signal_clicked().connect(sigc::mem_fun(*this, &MyDock::paddraw_clicked));
     draw_app.signal_delete_event().connect(sigc::mem_fun(*this, &MyDock::draw_win_closed));
+    draw_app.signal_hide().connect(sigc::mem_fun(*this, &MyDock::draw_win_hide));
 
     btnfiles->signal_clicked().connect(sigc::mem_fun(*this, &MyDock::btnfile_clicked));
     padfile->signal_clicked().connect(sigc::mem_fun(*this, &MyDock::padfile_clicked));
@@ -206,6 +207,11 @@ bool MyDock::draw_win_closed(GdkEventAny *event)
     return true;
 }
 
+void MyDock::draw_win_hide(){
+    btndraw->set_image_from_icon_name("drawing_app", Gtk::ICON_SIZE_DIALOG);
+    draw_app.hide();
+}
+
 void MyDock::btndraw_clicked()
 {
     btndraw->set_image_from_icon_name("drawing_app_running", Gtk::ICON_SIZE_DIALOG);
diff --git a/Gtkmm3_Mac/src/ui/MyDock.hh b/Gtkmm3_Mac/src/ui/MyDock.hh
index d98c414..3895a5c 100644
--- a/Gtkmm3_Mac/src/ui/MyDock.hh
+++ b/Gtkmm3_Mac/src/ui/MyDock.hh
@@ -53,6 +53,7 @@ private:
     bool draw_win_closed(GdkEventAny *event);
     void btndraw_clicked();
     void paddraw_clicked();
+    void draw_win_hide();
 
     // Finder
     FileWindow file_app;