如何改变wxpython网格布局方向？

import wx

class MyFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="GridBagSizer Example")

        panel = wx.Panel(self)

        sizer = wx.GridBagSizer(10, 10)

        # 添加窗口部件到网格中
        text1 = wx.StaticText(panel, label="Text 1")
        sizer.Add(text1, pos=(0, 0), flag=wx.ALL, border=5)

        text2 = wx.StaticText(panel, label="Text 2")
        sizer.Add(text2, pos=(1, 0), flag=wx.ALL, border=5)

        text3 = wx.StaticText(panel, label="Text 3")
        sizer.Add(text3, pos=(2, 0), flag=wx.ALL, border=5)

        text4 = wx.StaticText(panel, label="Text 4")
        sizer.Add(text4, pos=(3, 0), flag=wx.ALL, border=5)

        # 设置网格布局的方向
        sizer.AddGrowableCol(0)  # 设置第一列可伸缩

        panel.SetSizerAndFit(sizer)

app = wx.App()
frame = MyFrame()
frame.Show()
app.MainLoop()