--- a/demo/DVC_DataViewModel.py
+++ b/demo/DVC_DataViewModel.py
@@ -339,6 +339,20 @@ def runTest(frame, nb, log):

     # Finally create the test window
     win = TestPanel(nb, log, data=data)
+    import time
+    import threading
+    def hoge():
+        while win.model:
+            time.sleep(5)
+            song = random.choice(data[0].songs)
+            d = random.choice(range(27))+1
+            m = random.choice(range(12))
+            y = random.choice(range(1980, 2005))
+            song.date = wx.DateTime().FromDMY(d,m,y)
+            win.model.ValueChanged(win.model.ObjectToItem(song), 4)
+            print(song.genre, song.title)
+    threading.Thread(target=hoge, daemon=True).start()
+
     return win

 #----------------------------------------------------------------------