How to pass toolbar between classes

I'm trying to create 2 pages of wx.Notebook (each page is wx.Panel as a separate class). Class Main is wx.Frame. And when I try to set the menus it has to be inside of wx.Frame(Main class), however, my toolbars is in wx.Panel(A class).

I print (z which of element A) in hide_show_f.

What I want is, while pressing Hide-Show Tool menu which is checkable, Toolbar 2 is should be hidden and then show. How to succeed in it. Thanks.

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import wx
import wx.lib.agw.aui as aui

class Main ( wx.Frame ):            ### Background program which have real-time and text notebook-panels separately

    def __init__( self, parent ):
        self.parent = parent
        wx.Frame.__init__ ( self, parent, id = wx.ID_ANY, title = u"Main Frame", pos = wx.DefaultPosition, size = wx.Size( 500,350 ), style = wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL )

        p = wx.Panel(self)
        nb = wx.Notebook(p)
        page1 = A(nb)
        page2 = B(nb)
        nb.AddPage(page1, "A")
        nb.AddPage(page2, "B")
        sizer = wx.BoxSizer()
        sizer.Add(nb, 1, wx.EXPAND)  
        p.SetSizer(sizer)

        self.SetSizeHints( wx.DefaultSize, wx.DefaultSize )

        ###### view  menu
        self.menubar = wx.MenuBar( 0 )
        self.view_menu = wx.Menu()
        self.connecttool_menuItem = wx.MenuItem( self.view_menu, wx.ID_ANY, u"Hide-Show Tool", wx.EmptyString, wx.ITEM_NORMAL )
        self.view_menu.AppendCheckItem( self.connecttool_menuItem.GetId(), 'Hide-Show Tool')        

        self.menubar.Append( self.view_menu, u"View" )
        self.SetMenuBar( self.menubar )

        #Bind
        self.Bind( wx.EVT_MENU, self.hide_show_f, id = self.connecttool_menuItem.GetId() )


    def hide_show_f( self, event ):
        if event.IsChecked():
            print("hello")

            f = A(self)
            print(f.z)

            f._mgr.ClosePane(f.aui_tb2)
            f._mgr.Update()

        else:
            print("bye")


class A ( wx.Panel ):        
    def __init__( self, parent ):
        wx.Panel.__init__ ( self, parent )
        self.z = 54
        self.bSizer1 = wx.BoxSizer( wx.VERTICAL )

        ### auitoolbar 1
        self.tb1 = aui.AuiToolBar(self, -1, wx.DefaultPosition, wx.DefaultSize, agwStyle=aui.AUI_TB_DEFAULT_STYLE | aui.AUI_TB_OVERFLOW)
        self.Btn1 = wx.Button( self.tb1, wx.ID_ANY, u"Hide", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.tb1.AddControl( self.Btn1 )
        self.Btn2 = wx.Button( self.tb1, wx.ID_ANY, u"Show", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.tb1.AddControl( self.Btn2 )

        self.tb1.Realize()
        self.bSizer1.Add( self.tb1, 0, 0, 5 )

        ### auitoolbar 2
        self.tb2 = aui.AuiToolBar(self, -1, wx.DefaultPosition, wx.DefaultSize, agwStyle=aui.AUI_TB_DEFAULT_STYLE | aui.AUI_TB_OVERFLOW)
        self.Btn3 = wx.Button( self.tb2, wx.ID_ANY, u"Button", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.tb2.AddControl( self.Btn3 )
        self.tb2.Realize()
        self.bSizer1.Add( self.tb2, 0, 0, 5 )


        ### aui manager
        self._mgr = aui.AuiManager()
        self._mgr.SetManagedWindow(self)
        self.aui_tb1 = aui.AuiPaneInfo().Name("tb1").Caption("Hide-Show Tool").ToolbarPane().Top()
        self.aui_tb2 = aui.AuiPaneInfo().Name("tb2").Caption("Btn Tool").ToolbarPane().Top()
        self._mgr.AddPane(self.tb1, self.aui_tb1)
        self._mgr.AddPane(self.tb2, self.aui_tb2)
        self._mgr.Update()

        self.Btn1.Bind( wx.EVT_BUTTON, self.btn_1 )
        self.Btn2.Bind( wx.EVT_BUTTON, self.btn_2 )
        self.Btn3.Bind( wx.EVT_BUTTON, self.btn_3 )

    def btn_1(self, event):
        self._mgr.ClosePane(self.aui_tb2)
        self._mgr.Update()

    def btn_2(self, event):
        self._mgr.ShowPane(self.tb2, self.aui_tb2)
        self._mgr.Update()

    def btn_3(self, event):
        print("hello")


class B ( wx.Panel ):
    def __init__( self, parent ):
        wx.Panel.__init__ ( self, parent )

if __name__ == '__main__':
    app = wx.App()
    ex = Main(None)
    ex.Show()
    app.MainLoop()

This is what the self reference is used for, so that you don't have to redefine things again.
use:

self.page1 = A(nb)
self.page2 = B(nb)

make suitable amendments to page1 and page2 references
then:

def hide_show_f( self, event ):
    if event.IsChecked():
        print("hello")

        print(self.page1.z)

        self.page1._mgr.ClosePane(self.page1.aui_tb2)
        self.page1._mgr.Update()

    else:
        print("bye")

or better:

def hide_show_f( self, event ):
    if event.IsChecked():
        self.page1.btn_1(None)
    else:
        self.page1.btn_2(None)