title: wxPython: My toolbar does't show buttons in Windows
body: <p>I did a small application and it works nice in linux. But, I get some problems with the toolbar in Windows 7.
  The toolbar has some buttons which Windows doesn't show (But, there are in Linux). I am using Python 2.7 and wxPython 2.8.</p>
  
  <p>I don't know what I am missing.</p>
  
  <p>Regards,
  Cristian.</p>
  
  <pre><code>import wx
  from wx.lib.pubsub import Publisher
  from excel import excelmaker
  from model import Model
  from ObjectListView import ColumnDefn, ObjectListView
  import utils
  import threading
  
  wildcard = "Excel (*.xlsx)|*.xlsx|" \
          "All files (*.*)|*.*"
  
  class ApplicationGui(wx.App):
  
      def __init__(self, redirect=False, filename=None):
          wx.App.__init__(self, redirect, filename)
  
      def OnInit(self):
          # create frame here
          frame = MainFrame()
          frame.Show()
          return True
  
  class MainPanel(wx.Panel):
      def __init__(self,parent):
          self.exportText=''
  
          wx.Panel.__init__(self,parent=parent, id=wx.ID_ANY)
  
          self.objectListView = ObjectListView(self, wx.ID_ANY,style=wx.LC_REPORT|wx.SUNKEN_BORDER)
          self.objectListView.cellEditMode = ObjectListView.CELLEDIT_SINGLECLICK
          self.objectListView.SetObjects([Model()])
  
          mainSizer = wx.BoxSizer(wx.VERTICAL)
          self.create_toolbar(mainSizer)
          mainSizer.Add(self.progress, 0, wx.EXPAND)
          mainSizer.Add(self.objectListView, 1, wx.ALL|wx.EXPAND, 5)
          self.SetSizer(mainSizer)
  
      def create_toolbar(self,sizer):
          toolbar = wx.ToolBar(self)
  
          loadBtn = toolbar.AddLabelTool(wx.ID_ANY, 'Cargar Excel', wx.Bitmap('resources/open.png'), shortHelp='Cargar Excel')
          pasteBtn = toolbar.AddLabelTool(wx.ID_ANY, 'Pegar', wx.Bitmap('resources/paste.png'), shortHelp='Pegar Columnas')
          cleanBtn = toolbar.AddLabelTool(wx.ID_ANY, 'Borrar', wx.Bitmap('resources/clean.png'), shortHelp='Borrar tabla')
          toolbar.AddSeparator()
          addBtn = toolbar.AddLabelTool(wx.ID_ANY, 'Agregar', wx.Bitmap('resources/add.png'), shortHelp='Agregar fila')
  
          toolbar.AddSeparator()
          self.exportText = wx.TextCtrl(toolbar, -1, size=(140,-1))
          self.exportText.SetValue('output.xlsx')
          toolbar.AddControl(self.exportText)
          exportBtn = toolbar.AddLabelTool(wx.ID_ANY, 'Exportar', wx.Bitmap('resources/export.png'), shortHelp='Generar Excel')
  
          toolbar.AddSeparator()
          about = toolbar.AddLabelTool(wx.ID_ANY, 'Acerca', wx.Bitmap('resources/about.png'), shortHelp='Ayuda')
  
  
          randomId = wx.NewId()
          self.Bind(wx.EVT_MENU, self.onPaste, id=randomId)
          accel_tbl = wx.AcceleratorTable([(wx.ACCEL_CTRL,  ord('V'), randomId )])
          self.SetAcceleratorTable(accel_tbl)
  
          sizer.Add(toolbar, 0, wx.EXPAND)
          self.Bind(wx.EVT_TOOL, self.onOpenFile, loadBtn)
          self.Bind(wx.EVT_TOOL, self.onPaste, pasteBtn)
          self.Bind(wx.EVT_TOOL, self.onClean, cleanBtn)
          self.Bind(wx.EVT_TOOL, self.onExport, exportBtn)
          self.Bind(wx.EVT_TOOL, self.onAddRow, addBtn)
          self.Bind(wx.EVT_TOOL, self.onAbout, about)
  
  class MainFrame(wx.Frame):
      def __init__(self):
          wx.Frame.__init__(self, parent=None, id=wx.ID_ANY,
                        title="Exceltronic", size=(800,600))
          panel = MainPanel(self)
  </code></pre>