Clear statuses that aren't changed when switching to a different list

mytwitter.py

@@ -80,6 +80,8 @@ class MyTwitter():
         for i in range(0, self.num_entries):
             if i < len(statuses):
                 self.tweets[i].set_status(statuses[i])
+            else:
+                self.tweets[i].clear_status()
 
 
     def update_window_callback(self, widget):
@@ -213,6 +215,13 @@ class TweetBox(gtk.VBox):
         self.text.set_markup(new_text)
 
 
+    def clear_status(self):
+        self.header.set_markup('')
+        self.text.set_markup('')
+        self.screen_name = None
+        self.id = None
+
+
     def on_reply_clicked(self, widget):
         self.emit('reply')