#!/usr/bin/env python

import wx

class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="Title")

        panel = wx.Panel(self)
        box = wx.BoxSizer(wx.VERTICAL)

        button = wx.Button(panel, wx.ID_ANY, "Load image")
        button.Bind(wx.EVT_BUTTON, self.ChangeImage)
        box.Add(button, 0, wx.ALL, 10)

        self.image = wx.StaticBitmap(panel)
        box.Add(self.image, 0, wx.ALL, 10)

        panel.SetSizer(box)
        panel.Layout()

    def ChangeImage(self, event):
        wx.CallAfter(self.image.SetBitmap, wx.Bitmap(wx.Image("usingBitmaps.png", wx.BITMAP_TYPE_ANY).Rescale(150, 150)))

if __name__ == "__main__":
    app = wx.App()
    top = Frame()
    top.Show()
    app.MainLoop()