title: generating buttons after a if statement in wxPython
body: <p>I have wxPython application were user gives a file as an input, and then my program should generate 2 dropdown lists for each line from the file. Problem is that no buttons are generated after user gives a file as an input, this is done in menu and self.content gets it's items. I have tried to call myButtons method after user gives the file, but it didn't work either. </p>
  
  <p>Here is my simplified code for buttons:</p>
  
  <pre><code>class size:
      def __init__(self, id, name):
          self.id = id
          self.name = name
  
  class type:
      def __init__(self, id, name):
          self.id = id
          self.name = name
  
  class GUI(wx.Frame):
      def __init__(self, parent, id, title):
          self.dirname = ''
          self.content = ''
  
          wx.Frame.__init__(self, parent, id, title, size=(700, 400))
  
          #UI stuff
          panelControl = wx.Panel(self, 1, style=wx.MAXIMIZE) 
          sizerControl = wx.GridBagSizer(hgap=4,vgap = 4)
  
          self.menu()
          #buttons
          if not self.content == '':
              self.myButtons()
  
  
      def myButtons(self): 
          listOfObjects = self.content #list if lists
          #content of the dropdown lists
          sizes = [size(0, 'very small'), size(1, 'small'), size(2, 'medium'), size(3, 'large'), size(4,'very large')]
          types = [type(0, 'UI'), type(1, 'text'), type(2, 'I/O'), type(3, 'calculation'), 
              type(4, 'set-up'), type(5,  'logic'), type(6, 'data')]
  
          for i in listOfObjects:
              lista = [] #save the dropdown list selections
              panel = wx.Panel(self, wx.ID_ANY)
              self.labelthing = wx.StaticText(panel, label="Object name: %s LOC: %s Method amount: %s Mean: %s"%(i[0], i[1], i[2], i[3]))
              self.sizeDrop = wx.ComboBox(panel,
                            size=wx.DefaultSize,
                            choices=lista)
  
              self.typeDrop = wx.ComboBox(panel,
                            size=wx.DefaultSize,
                            choices=lista)
  
              self.widgetMaker(self.sizeDrop, self.typeDrop)    
              self.Show()
  
  
      def widgetMaker(self, widget1, widget2):
          widget1.Bind(wx.EVT_COMBOBOX, self.onSelect)
          widget2.Bind(wx.EVT_COMBOBOX, self.onSelect)
  
  
      def onSelect(self, event):
          #wait for the both dropdown list values, then do stuff
          pass
  
      def menu(self):
          #do other stuff too
          self.content = [['foo1', 1 , 'bar1', 1],['foo2', 1 , 'bar2', 1]]
  
  if __name__ == "__main__":
      app = wx.PySimpleApp()
      frame = GUI(None, -1, "") 
      frame.Show(1)
      app.MainLoop()
  </code></pre>