moving from tkinter to wxpython

[Barrowman]

I really appreciate all the help. I think I have a long way to go before I can be anywhere as confident I know as much about the way wxpython works as I do tkinter ( and that isn't much.)
Here is a bit of the script I have so far.

class MouseEventFrame(wx.Frame):
    def __init__(self, parent, id):
        wx.Frame.__init__(self, parent, id, 'Frame and Button', size=(1210, 400))
        self.panel = wx.Panel(self)
        row = 0
        column = 0
  
        for x in range(1,67):
            txt = books[x]
            myname = txt[0:-3]
            while (len(myname) < 15):
               myname = " " + myname
            while (len(myname) < 20):
                myname += " "
            self.btn = 'butt' + str(x)
            btn = wx.Button(self.panel, -1, myname, pos=(column, row ) )
            self.Bind(wx.EVT_BUTTON, self.OnClick,btn)
            self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnterWindow,btn)
            column += 120
            if column == 1200:
                column = 0
                row += 55
    def OnClick(self, event):
       obj = event.GetEventObject()
       print("You clicked %s"%obj.GetLabel())
       event.Skip()       

    def OnEnterWindow(self, event,myname):
        obj = event.GetEventObject()
        print("Success at last!%s"%obj.GetLabel())
        print("Success at last! ",btn[-3:])
        event.Skip()
        

app = wx.App()
frame = MouseEventFrame(parent=None, id=-1)

frame.Show()
app.MainLoop()

The OnClick event works but the OnEnterWindow does nothing.
I get no errors but no output appears.