first try

examples/button.nim

@@ -0,0 +1,23 @@
+# nim c button.nim
+import gintro/[gtk, glib]
+import gintro/gio except Application, newApplication
+
+proc buttonClicked (button: Button) =
+  button.label = utf8Strreverse(button.label, -1)
+
+proc activate (app: Application) =
+  let window = newApplicationWindow(app)
+  window.title = "GNOME Button"
+  window.defaultSize = (250, 50)
+  let button = newButton("Click Me")
+  window.add(button)
+  button.connect("clicked",  buttonClicked)
+  window.showAll
+
+proc main =
+  let app = newApplication("org.gtk.example")
+  connect(app, "activate", activate)
+  discard app.run
+
+main()
+