主面板及搜索面板

主面板样式及代码：

# -*- coding: utf-8 -*-
"""
Created on Tue Jul 19 16:57:27 2016

@author: hugo
"""

import wx

# 实例化一个APP
app = wx.App()

# 创建一个Frame
main = wx.Frame(None, title = "Demo", size = (450,350))

# 打开布局画板
mainpanel = wx.Panel(main)

# 创建一个垂直布局箱子
Vbox = wx.BoxSizer(wx.VERTICAL)

SearchButton = wx.Button(mainpanel, label=u"结构搜索")
SubmitJobButton = wx.Button(mainpanel, label=u"作业提交")
AnalyzeButton = wx.Button(mainpanel, label=u"结果分析")

Vbox.Add(SearchButton, proportion=1, flag=wx.EXPAND)
Vbox.Add(SubmitJobButton, proportion=1, flag=wx.EXPAND, border=5)
Vbox.Add(AnalyzeButton, proportion=1, flag=wx.EXPAND, border=5)

mainpanel.SetSizer(Vbox)
#显示
main.Show()
#主循环
app.MainLoop()

搜索面板样式及代码：

# -*- coding: utf-8 -*-
"""
Created on Tue Jul 19 12:59:59 2016

@author: hugo
"""
#导入库
import wx
#实例化一个app
app=wx.App()
#创建一个Frame
win = wx.Frame(None,title = u"结构搜索", size=(450,350))

#打开布局画板
Bkg = wx.Panel(win)

#创建一个水平布局箱子
Hbox = wx.BoxSizer(wx.HORIZONTAL)

# 搜索模式
#modelist = [u‘分子量‘, u‘分子式‘]
#SearchMode = wx.ComboBox(Bkg, -1, u‘分子量‘, (15, 15), wx.DefaultSize, modelist, wx.CB_DROPDOWN)
SearchMode = wx.Button(Bkg, label = u"分子量")

# 搜索框
SearchBox = wx.TextCtrl(Bkg)

# 搜索按钮
searchpng = wx.Image(‘search.png‘, wx.BITMAP_TYPE_PNG).ConvertToBitmap()
SearchButton = wx.BitmapButton(Bkg, -1, searchpng, size = (30,30))
#SearchButton = wx.Button(Bkg, label = u"搜索")

Hbox.Add(SearchMode, proportion = 0, flag = wx.LEFT)
Hbox.Add(SearchBox, proportion = 1, flag = wx.EXPAND | wx.LEFT, border = 5)
Hbox.Add(SearchButton, proportion = 0, flag = wx.LEFT, border = 5)

ContentsTxtCtl = wx.TextCtrl(Bkg, style = wx.TE_MULTILINE | wx.HSCROLL)

# 创建一个垂直布局箱子
Vbox = wx.BoxSizer(wx.VERTICAL)
Vbox.Add(Hbox, proportion = 0, flag = wx.EXPAND | wx.ALL, border = 5)
Vbox.Add(ContentsTxtCtl, proportion = 1, flag = wx.EXPAND | wx.RIGHT | wx.BOTTOM, border = 5)
Bkg.SetSizer(Vbox)

#显示
win.Show()
#主循环
app.MainLoop()

问题：如何通过点击主面板上的“结构搜索”进入“搜索面板”