diff --git a/Gtk3/gtk41/res/window.ui b/Gtk3/gtk41/res/window.ui
index 1483ba4..56d5c07 100644
--- a/Gtk3/gtk41/res/window.ui
+++ b/Gtk3/gtk41/res/window.ui
@@ -33,7 +33,15 @@
         <property name="show-close-button">True</property>
         <property name="decoration-layout">close,minimize,maximize:icon</property>
         <child>
-          <placeholder/>
+          <object class="GtkButton" id="btnsize">
+            <property name="label" translatable="yes">Win size</property>
+            <property name="visible">True</property>
+            <property name="can-focus">True</property>
+            <property name="receives-default">True</property>
+          </object>
+          <packing>
+            <property name="pack-type">end</property>
+          </packing>
         </child>
       </object>
     </child>
diff --git a/Gtk3/gtk41/res/window.ui~ b/Gtk3/gtk41/res/window.ui~
index 5f40ab7..1483ba4 100644
--- a/Gtk3/gtk41/res/window.ui~
+++ b/Gtk3/gtk41/res/window.ui~
@@ -26,7 +26,16 @@
       </object>
     </child>
     <child type="titlebar">
-      <placeholder/>
+      <object class="GtkHeaderBar">
+        <property name="visible">True</property>
+        <property name="can-focus">False</property>
+        <property name="title" translatable="yes">gtk41</property>
+        <property name="show-close-button">True</property>
+        <property name="decoration-layout">close,minimize,maximize:icon</property>
+        <child>
+          <placeholder/>
+        </child>
+      </object>
     </child>
   </object>
 </interface>
diff --git a/Gtk3/gtk41/src/main.cpp b/Gtk3/gtk41/src/main.cpp
index 92ee4b8..ba64b30 100644
--- a/Gtk3/gtk41/src/main.cpp
+++ b/Gtk3/gtk41/src/main.cpp
@@ -1,6 +1,12 @@
 #include <gtk/gtk.h>
 #include "res/winpe.xpm"
 
+void get_winsize(GtkWidget *widget,GtkWindow *window){
+    gint width,height;
+    gtk_window_get_size(window,&width,&height);
+    g_print("%d %d\n",width,height);
+}
+
 gboolean window_resize(GtkWidget *widget,GdkEvent *event,GtkBuilder *builder){
     //Get window size
     gint width,height;
@@ -22,6 +28,9 @@ static void gtkmain(GtkApplication *app,gpointer user_data){
     GtkBuilder *builder=gtk_builder_new_from_file("res/window.ui");
     GObject *window=gtk_builder_get_object(builder,"window");
     gtk_application_add_window(app,GTK_WINDOW(window));
+    //Get window size
+    GObject *btnsize=gtk_builder_get_object(builder,"btnsize");
+    g_signal_connect(btnsize,"clicked",G_CALLBACK(get_winsize),window);
     gtk_widget_show_all(GTK_WIDGET(window));
     g_signal_connect(window,"window-state-event",G_CALLBACK(window_resize),builder);
 }