Fix compile error

XeRelease_Gtkmm3/MyWin.hh

@@ -1,31 +0,0 @@
-#pragma once
-
-#include <gtkmm.h>
-
-class MyWin : public Gtk::ApplicationWindow{
-public:
-    MyWin();
-private:
-    //Child Widgets
-    Glib::RefPtr<Gtk::Builder> menu_builder;
-
-    //Main window
-    Gtk::Image background;
-    Gtk::Overlay overlay;
-    Gtk::Box btn_box;
-    Gtk::ComboBoxText combo;
-    Gtk::Button btn_ver;
-
-    //TitleBar and menu
-    Gtk::HeaderBar header;
-    Gtk::MenuButton menubtn;
-    Gtk::PopoverMenu popover;
-    void titlebar_init();
-
-    //Backgrounds
-    void background1();
-    void background2();
-
-    //Signal Handlers
-    void about_dialog();
-};

XeRelease_Gtkmm3/src/MyWin.hh

@@ -25,4 +25,7 @@ private:
     //Backgrounds
     void background1();
     void background2();
+
+    //Signal Handlers
+    void about_dialog();
 };