Popup Window with Controls not working

I have created a simple implementation of a popup window with a 
CheckListBox and a couple of buttons as below:

[image: Annotation 2019-10-03 193337.jpg]
and here is the code
class MyPopList(wx.PopupWindow): 
    def __init__(self, parent, lst):
        wx.PopupWindow.__init__(self, parent, flags=wx.SIMPLE_BORDER | 
wx.PU_CONTAINS_CONTROLS)
        
        #self.parent = parent
        #self.lst = lst
        
        panel = wx.Panel(self)
        panel.SetBackgroundColour("LIGHT GREY")
        
        self.clb = wx.CheckListBox(panel, id=wx.ID_ANY, choices=lst, 
style=wx.LB_MULTIPLE, validator=wx.DefaultValidator)
        
        topsizer = wx.BoxSizer(wx.VERTICAL)
        
        topsizer.Add(self.clb, wx.SizerFlags(0).Center().Border(wx.ALL, 
2).Expand())
        
        button_sizer = wx.BoxSizer(wx.HORIZONTAL)
        button_sizer.Add(wx.Button(panel, wx.ID_OK, "Apply"),
                wx.SizerFlags(0).Align(wx.ALIGN_CENTER).Border(wx.ALL, 5))
        button_sizer.AddSpacer(15)
        button_sizer.Add(wx.Button(panel, wx.ID_CANCEL, "Cancel"),
                wx.SizerFlags(0).Align(wx.ALIGN_CENTER).Border(wx.ALL, 5))
        
        topsizer.Add(button_sizer,
                wx.SizerFlags(0).Center())
        
        
        panel.SetSizer(topsizer)
        #panel.SetFocus()
        topsizer.Fit(panel)
        topsizer.Fit(self)
        self.Layout()
        
        
        print(self.GetChildren())
        
        
        self.clb.Bind(wx.EVT_CHECKLISTBOX, self.FilterChoice) 
        self.Bind(wx.EVT_BUTTON, self.GetChoices)
        
        
    def ProcessLeftDown(self, evt):
        print("Mouse button pressed")
        return wx.PopupTransientWindow.ProcessLeftDown(self, evt)
        
        
    def ShowList(self):
        #self.clb.Set(lst)
        self.Show()
        
    
        
    def FilterChoice(self, event):
        print("List Clicked")
        event.Skip()


    def GetChoices(self, event):
        print("button Clicked")
        self.Destroy()
        #event.Skip()

The problem is I cannot get the list to respond to mouse clicks .... 
buttons are working fine
moreover when I use the style wx.PU_CONTAINS_CONTROLS as stated in the 
popup docs *HERE 
<https://wxpython.org/Phoenix/docs/html/wx.PopupWindow.html#styles-window-styles>*
I receive this error msg

> wx.PopupWindow.__init__(self, parent, flags=wx.SIMPLE_BORDER | 
>> wx.PU_CONTAINS_CONTROLS)
>
> AttributeError: module 'wx' has no attribute 'PU_CONTAINS_CONTROLS'
>
>
Any help is greatly appreciated

Python 3.7.3
Phoenix 4.0.4
windows 10 

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