Passing value between frames

import wx
import cx_Oracle
import wx.grid as gridlib

class PerfFrame(wx.Frame):
    def __init__(self,parent,title):
        frame = wx.Frame.__init__(self,parent,title=title)        
        panel = wx.Panel(self)        
        self.statusbar=self.CreateStatusBar()        
        self.statusbar.SetStatusText("Not Connected")
        
        self.frame = frame
        # Menu Details
        perfmenu = wx.Menu()
        newcon = wx.MenuItem(perfmenu,wx.NewId(),"&New Connection","Opening a new connection")
        perfmenu.AppendItem(newcon)
        perfmenu.AppendSeparator()
        menuAbout = perfmenu.Append(wx.ID_ABOUT,"&About","Information about this program")
        perfmenu.AppendSeparator()
        menuExit = perfmenu.Append(wx.ID_EXIT,"E&xit","Exit the program")
        
        mainmenu = wx.MenuBar()
        mainmenu.Append(perfmenu,"Perf")
        self.SetMenuBar(mainmenu)

        self.Bind(wx.EVT_MENU, self.OnConn, newcon)
        self.Bind(wx.EVT_MENU, self.OnAbout, menuAbout)
        self.Bind(wx.EVT_MENU, self.OnExit, menuExit)     
        self.Show(True)

    def OnCloseWindow (self, event):
        self.Destroy()        

    def OnConn(self,event):
        self.connstr=AP_LoginPanel(self.frame,-1,"Authentification required!").GetConnStr()

    def OnAbout(self,event):
        dlg=wx.MessageDialog(self,"Open Source AWR Viewer","About Performance Maintenance",wx.OK)
        dlg.ShowModal()
        dlg.Destroy()

    def OnExit(self,event):
        self.Close(True)

class AP_LoginPanel(wx.Frame):
    def __init__(self, parent, id,  title):
        frame = wx.Frame.__init__(self,parent,id, title=title,size=(400,300))
        self.frame = frame        
        self.panel = wx.Panel(frame)
        self.showLoginBox()
        self.Show(True)
        
    def showLoginBox (self):
  # Create the sizer
        sizer = wx.FlexGridSizer(rows=6, cols=2, hgap=5, vgap=15)

  # Username
        self.txt_Username = wx.TextCtrl(self, 1, size=(150,-1), style=wx.TE_LEFT)
        lbl_Username = wx.StaticText(self, -1, "Username:")
        sizer.Add(lbl_Username,0, wx.LEFT|wx.TOP| wx.RIGHT, 50)
        sizer.Add(self.txt_Username,0, wx.TOP| wx.RIGHT, 50)

  # Password
        self.txt_Password = wx.TextCtrl(self, 1, size=(150,-1), style=wx.TE_PASSWORD)
        lbl_Password = wx.StaticText(self, -1, "Password:")
        sizer.Add(lbl_Password,0, wx.LEFT|wx.RIGHT, 50)
        sizer.Add(self.txt_Password,0, wx.RIGHT, 50)

  # Host String
        self.txt_hoststr = wx.TextCtrl(self, 1, size=(150,-1), style=wx.TE_LEFT)
        lbl_HostStr = wx.StaticText(self, -1, "Host String:")
        sizer.Add(lbl_HostStr,0, wx.LEFT|wx.RIGHT, 50)
        sizer.Add(self.txt_hoststr,0, wx.RIGHT, 50)

  # Port
        self.txt_port = wx.TextCtrl(self, 1, size=(150,-1), style=wx.TE_LEFT)
        lbl_port = wx.StaticText(self, -1, "Port:")
        sizer.Add(lbl_port,0, wx.LEFT| wx.RIGHT, 50)
        sizer.Add(self.txt_port,0, wx.RIGHT, 50)

  # Service
        self.txt_sid = wx.TextCtrl(self, 1, size=(150,-1), style=wx.TE_LEFT)
        lbl_sid = wx.StaticText(self, -1, "SID/Service Name:")
        sizer.Add(lbl_sid,0, wx.LEFT| wx.RIGHT, 50)
        sizer.Add(self.txt_sid,0, wx.RIGHT, 50)

  # Submit button
        btn_Process = wx.Button(self, -1, "&Login")
        self.Bind(wx.EVT_BUTTON, self.OnSubmit, btn_Process)
        sizer.Add(btn_Process,0, wx.LEFT, 50)
        self.SetSizer(sizer)

    def OnSubmit(self, event):
        UserText = self.txt_Username.GetValue()
        PasswordText = self.txt_Password.GetValue()
        HostText = self.txt_hoststr.GetValue()
        PortText = self.txt_port.GetValue()
        SIDText = self.txt_sid.GetValue()
        self.connstr = UserText+"/"+PasswordText+"@"+HostText+":"+PortText+"/"+SIDText
        self.TestConnection()
        self.Close(True)

    def TestConnection(self):
        dlg = wx.MessageDialog(self,self.connstr,"You Entered",wx.OK | wx.CANCEL)
        dlg.ShowModal()
        dlg.Destroy()
        #con= cx_Oracle.connect(self.connstr)        
     
    def  GetConnStr(self):
        return self.connstr
        
app=wx.App(False)
frame=PerfFrame(None,"Oracle Perf Maintenance")
app.SetTopWindow(frame)
app.MainLoop()