怎么给wxpython里的窗口添加滚动条

#-*- encoding:UTF-8 -*-

import wx

import wx.grid

class TestTable(wx.grid.PyGridTableBase):#定义网格表

    def __init__(self):

        wx.grid.PyGridTableBase.__init__(self)

        self.data = { (1,1) : 'Here',

        (2,2) : 'is',

        (3,3) : 'some',

        (4,4) : 'data',

        }

        self.odd=wx.grid.GridCellAttr()

        self.odd.SetBackgroundColour('sky blue')

        self.odd.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.BOLD))

        self.even=wx.grid.GridCellAttr()

        self.even.SetBackgroundColour('sea green')

        self.even.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.BOLD))

    # these five are the required methods

    def GetNumberRows(self):

        return 50

    def GetNumberCols(self):

        return 50

    def IsEmptyCell(self, row, col):

        return self.data.get((row, col)) is not None

    def GetValue(self, row, col):#为网格提供数据

        value = self.data.get((row, col))

        if value is not None:

            return value

        else:

            return ''

    def SetValue(self, row, col, value):#给表赋值

        self.data[(row,col)] = value

    # # the table can also provide the attribute for each cell

    def GetAttr(self, row, col, kind):

        attr = [self.even, self.odd][row % 2]

        attr.IncRef()

        return attr

class TestFrame(wx.Frame):

    def __init__(self):

        wx.Frame.__init__(self, None, title='Grid Table',

        size=(640,480))

        grid = wx.grid.Grid(self)

        #这里是一个grid表

        table = TestTable()

        grid.SetTable(table, True)

        # 这里是第二个个grid表

        le = TestTable()

        grid.SetTable(le, True)

app = wx.PySimpleApp()

frame = TestFrame()

frame.Show()

app.MainLoop()