title: PyGTK TreeView showing blank rows from ListStore
body: <p>I'm trying to show several rows from database in a TreeView but all I am getting are some dummy rows as you can see in the image below.</p>
  
  <p><img src="https://i.stack.imgur.com/pF6BU.png" alt="Application Screenshot"></p>
  
  <pre><code>class SettingsDialog(gtk.Dialog):
      def __init__(self):
          gtk.Dialog.__init__(self, "Server Settings", self, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT)
  
          # Instantiate ServerManager
          self.server_manager = ServerManager()
  
          # Create TreeStore for Server list
          self.liststore = gtk.ListStore(str, str)
          self.treeview = gtk.TreeView(self.liststore)
  
          # Create TreeViewColumns to display data
          cell = gtk.CellRendererText()
          col = gtk.TreeViewColumn("Name")
          col.pack_start(cell, True)
          self.treeview.append_column(col)
  
          cell = gtk.CellRendererText()
          col = gtk.TreeViewColumn("URL")
          col.pack_start(cell, True)
          self.treeview.append_column(col)
  
          self.vbox.pack_start(self.treeview)
  
          self.resize(500,350)
          self.set_position(gtk.WIN_POS_CENTER)
          self.show_all()
  
          self.load_server_list()
  
  
      def load_server_list(self):
          self.liststore.clear()
          servers = self.server_manager.list()
          for name, url in servers.iteritems():
                  self.liststore.append([name, url])
          self.show_all()
  </code></pre>
  
  <p>Data returned from <code>self.server_manager.list()</code> is valid an added to the list store perfectly. There seems to be something wrong with the <code>CellRenderers</code> but I wasn't able to find the error.</p>