title: how to use ObjectListView in wxpython
body: <p>I am using a wxpython to contain an ObjectListView. I tried to put it into a wx.panel, but failed. The following is the image<img src="https://i.stack.imgur.com/BsFA2.png" alt="enter image description here"></p>
  
  <p>I am very puzzled that why the ObjectListView is only showed in a 16x16 square? My code to realize the ObjectListView:</p>
  
  <pre><code>and my code to use it:    
  `LeftList = wx.BoxSizer( wx.VERTICAL )    
  self.m_panel2 = wx.Panel( self, wx.ID_ANY, wx.DefaultPosition, wx.DefaultSize,          wx.TAB_TRAVERSAL )    
  p1 = MyListCtrl(self.m_panel2, -1)    
  LeftList.Add( p1, 1, wx.EXPAND |wx.ALL, 5 )    
  bSizer12.Add( LeftList, 1, wx.EXPAND, 5 )`
  
  and my code of MyListCtrl is:    
  `class MyListCtrl(wx.Panel):    
  def __init__(self, parent, id):       
  wx.Panel.__init__(self, parent=parent, id=wx.ID_ANY)
  self.olv = ObjectListView(self, id, style=wx.LC_REPORT|wx.NO_BORDER)    
  self.Layout()    
  self.olv.SetColumns(...)  `  
  </code></pre>
  
  <p>Then the result is the image I posted at the head</p>
  
  <p>My problem is what should I use to contain the ObjectListView in wxpython and how to use it</p>