Information Sharer: 代码顺序带来的问题，wxpython sizer 使用体验

昨天测试了一段代码，是关于notebook，和sizer运用的。代码如下：

import wx

#----------------------------------------------------------------------
class MyTabbedDlg(wx.Dialog):
def __init__(self, parent):
title = "Resize the dialog and see how controls adapt!"
wx.Dialog.__init__(self, parent, -1, title,
style=wx.DEFAULT_DIALOG_STYLE|wx.RESIZE_BORDER)

notebook = wx.Notebook(self, -1, size=(450,300))
panel1 = wx.Panel(notebook)
panel2 = wx.Panel(notebook)

notebook.AddPage(panel1, "Panel 1")
notebook.AddPage(panel2, "Panel 2")

dialog_sizer = wx.BoxSizer(wx.VERTICAL)
dialog_sizer.Add(notebook, 1, wx.EXPAND|wx.ALL, 5)

panel1_sizer = wx.BoxSizer(wx.VERTICAL)
text = wx.TextCtrl(panel1, -1, "Hi!", size=(400,90), style=wx.TE_MULTILINE)
button1 = wx.Button(panel1, -1, "I only resize horizontally...")
panel1_sizer.Add(text, 1, wx.EXPAND|wx.ALL, 10)
panel1_sizer.Add(button1, 0, wx.EXPAND|wx.ALL, 10)
panel1.SetSizer(panel1_sizer)

panel2_sizer = wx.BoxSizer(wx.HORIZONTAL)
button2 = wx.Button(panel2, -1, "I resize vertically")
button3 = wx.Button(panel2, -1, "I don't like resizing!")
panel2_sizer.Add(button2, 0, wx.EXPAND|wx.ALL, 20)
panel2_sizer.Add(button3, 0, wx.ALL, 100)
panel2.SetSizer(panel2_sizer)

if "__WXMAC__" in wx.PlatformInfo:
self.SetSizer(dialog_sizer)
else:
self.SetSizerAndFit(dialog_sizer)
self.Centre()

self.Bind(wx.EVT_BUTTON, self.OnButton)

def OnButton(self, evt):
self.EndModal(0)

#----------------------------------------------------------------------
class MyApp(wx.App):
def OnInit(self):
dlg = MyTabbedDlg(None)
dlg.ShowModal()
dlg.Destroy()
return True

myapp = MyApp(redirect=False)
myapp.MainLoop()