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Updating / updating dynamically created WxPython Widgets

The new python programmer is here and is trying to learn how to dynamically update widgets. For starters, I have the following code. What I would like to do is change my "self.dynamiclength" variable to any integer, and WxPython will update the number of widgets accordingly. I tried to put self.Refresh () and self.Update () in my test array after updating self.dynamiclength to no avail.

I did as much reading as possible before resorting to asking for help, but I'm too new to Wx to solve this problem myself. Thank you very much!

import wx
import  wx.lib.scrolledpanel as scrolled

class TestFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, size=(1000, 550))
        panel = wx.Panel(self)

        mainSizer = wx.BoxSizer(wx.VERTICAL)
        pbox0 = wx.BoxSizer(wx.VERTICAL)
        controlback0 = wx.Button(panel, label="Back0")
        controlforward0 = wx.Button(panel, label="Forward0")
        pbox0.Add(controlback0, 0, wx.ALL)
        pbox0.Add(controlforward0, 0, wx.ALL)
        mainSizer.Add(pbox0)

        self.scrolling_window = scrolled.ScrolledPanel( panel )
        self.scrolling_window.SetAutoLayout(1)
        self.scrolling_window.SetupScrolling()
        self.sizer = wx.BoxSizer( wx.VERTICAL )
        self.child_windows = []

        ##############################################
        #this is the variable that I want to change, 
        #and I don't know how to get the 'for loop' 
        #below to update as well. 

        self.eedictionary = {}
        self.dynamiclength = 5
        for i in range(0,self.dynamiclength):
            wind = self.addBox(i)
            self.sizer.Add(wind, 0, wx.CENTER|wx.ALL, 5)
        ###############################################
        #the following code binds all appropriate buttons to a pedigree variable updater
        button_binding_list = ['controlback','controlforward']
        for j in button_binding_list:
            eid = self.eedictionary[str(i)+j]
            self.scrolling_window.Bind(wx.EVT_BUTTON, lambda evt: self.onclick(evt, id), id=eid)

        self.scrolling_window.SetSizer(self.sizer)

        mainSizer.Add(self.scrolling_window, 1, wx.EXPAND)
        panel.SetSizer(mainSizer)

    def addBox(self, i):
        pbox = wx.BoxSizer(wx.VERTICAL)

        controlback = wx.Button(self.scrolling_window, label="Back")
        controlforward = wx.Button(self.scrolling_window, label="Forward")

        pbox.AddMany([(controlback, 0, wx.ALL), (controlforward, 0, wx.ALL)])

        #for each object created in the addBox module, its id is added to the dictionary 
        self.eedictionary[str(i)+'controlback'] = controlback.GetId()
        self.eedictionary[str(i)+'controlforward'] = controlforward.GetId()
        return pbox

    def onclick(self, event):
        self.dynamiclength +=1
        print 'added one to self.dynamiclength', self.dynamiclength

if __name__=='__main__':
    app = wx.App(False)
    f = TestFrame()
    f.Show()
    app.MainLoop()
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import wx

#===================================================================================================
class UpperPanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.combo = wx.ComboBox(self, choices=["0", "1", "2", "3", "4"], size=(200, -1))
        self.combo.Bind(wx.EVT_COMBOBOX, self.GetParent().middlePanel.Change)
        self.logo = wx.Button(self, size=(300, 100))

        self.sizer = wx.BoxSizer()
        self.sizer.Add(self.combo, 0, wx.EXPAND)
        self.sizer.Add(self.logo, 0, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)

#===================================================================================================
class MiddlePanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.subs = []
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.SetSizerAndFit(self.sizer)


    def Change(self, e):
        self.sizer = wx.BoxSizer(wx.VERTICAL)

        for a in self.subs:
            a.Destroy()

        self.subs = []

        for a in range(int(e.GetString())):
            b = wx.Button(self, size=(-1, 50))
            self.subs.append(b)
            self.sizer.Add(b, 1, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)
        self.GetParent().Fit()

#===================================================================================================
class MainWin(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None)

        self.middlePanel = MiddlePanel(self)
        self.upperPanel = UpperPanel(self)
        self.textArea = wx.TextCtrl(self, size=(-1, 300), style=wx.TE_MULTILINE)

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.upperPanel, 0, wx.EXPAND)
        self.sizer.Add(self.middlePanel, 0, wx.EXPAND)
        self.sizer.Add(self.textArea, 1, wx.EXPAND)

        self.SetSizerAndFit(self.sizer)

#===================================================================================================
if __name__ == '__main__':
    app = wx.PySimpleApp()
    main_win = MainWin()
    main_win.Show()
    app.MainLoop()
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