wxpython 高级窗口 怎样分为多栏

import wx


class MyFrame(wx.Frame):
    def __init__(self):
        super().__init__(parent=None, title='高级窗口', size=(350, 180))
        self.Center()
        splitter = wx.SplitterWindow(self, -1)
        leftpanel = wx.Panel(splitter)
        rightpanel = wx.Panel(splitter)
        splitter.SplitVertically(leftpanel, rightpanel, 100)
        splitter.SetMinimumPaneSize(80)
        splitter_right = wx.SplitterWindow(rightpanel, -1)
        rightpanel_top = wx.Panel(rightpanel)
        rightpanel_bottom = wx.Panel(rightpanel)
        splitter_right.SplitHorizontally(rightpanel_top, rightpanel_bottom, -1)
        list2 = ['苹果', '桔子', '香蕉', '椰子', '1', '2', '3', '4', '5', '6', '7']
        lb2 = wx.ListBox(leftpanel, -1, choices=list2, style=wx.LB_SINGLE)
        self.Bind(wx.EVT_LISTBOX, self.listbox, lb2)
        vbox = wx.BoxSizer(wx.VERTICAL)
        vbox.Add(lb2, 1, flag=wx.ALL | wx.EXPAND, border=5)
        leftpanel.SetSizer(vbox)

        vbox2 = wx.BoxSizer(wx.VERTICAL)
        self.text = wx.StaticText(rightpanel_top, label='右上侧面板')
        vbox2.Add(self.text, 1, flag=wx.ALL | wx.EXPAND, border=5)

        vbox3 = wx.BoxSizer(wx.VERTICAL)
        self.text1 = wx.StaticText(rightpanel_top, label='右下侧面板')
        vbox3.Add(self.text, 1, flag=wx.ALL | wx.EXPAND, border=5)

    def listbox(self, event):
        s = '选择{0}'.format(event.GetString())
        self.text.SetLabel(s)
        pass


class App(wx.App):
    def OnInit(self):
        frame = MyFrame()
        frame.Show()
        return True


app = App()
app.MainLoop()

求大神帮我改改，我想把它分为左侧，右上，右下三栏，应该怎么写

wxpython 有个界面设计软件：wxFormBuilder，可以参考一下：https://xyhuang.blog.csdn.net/article/details/61195367，如有帮助，望采纳，谢谢

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