diff --git a/Makefile b/Makefile
index 8df1aca..a21b90f 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,8 @@
 
 demos = just-text \
 	window-with-text\
-	two-windows
+	two-windows \
+	doupdate
 demos_files = $(patsubst %, %.exe, $(demos))
 
 .PHONY: all
diff --git a/doupdate.vala b/doupdate.vala
new file mode 100644
index 0000000..37d1cb9
--- /dev/null
+++ b/doupdate.vala
@@ -0,0 +1,57 @@
+using Curses;
+using Posix;
+
+public class Demo {
+  public MainLoop loop;
+  private TimeoutSource time;
+
+  public Demo() {
+    loop = new MainLoop();
+    time = new TimeoutSource (5000);
+    time.set_callback (() => { loop.quit(); return false; });
+    time.attach(loop.get_context());
+  }
+
+  public void start() {
+    initscr();
+    noecho();
+  }
+
+  public void stop() {
+    endwin();
+  }
+
+  private Window window1;
+  private Window window2;
+  public void activate() {
+    this.window1 = new Window(5, 20, 1, 1);
+    this.window1.box(0, 0);
+    this.window1.mvprintw(1, 1, "I am in window 1");
+    this.window1.noutrefresh();
+
+    this.window2 = new Window(5, 20, 1, 21);
+    this.window2.box(0, 0);
+    this.window2.mvprintw(1, 1, "I am in window 2");
+    //this.window2.noutrefresh();
+  }
+
+  public void run() {
+    loop.run();
+  }
+
+  public void redraw() {
+    doupdate();
+  }
+
+  static int main(string[] args) {
+    var app = new Demo();
+
+    app.start();
+    app.activate();
+    app.redraw();
+    app.run();
+    app.stop();
+
+    return EXIT_SUCCESS;
+  }
+}