Using Custom ArtProvider

[Noah]

I am using version 2.8.12.1 and I am also borrowing from the "wxPython 2.8 Cookbook".

I want to add my own images to the art provider. I pasted the relevant code below. I overwrite the CreateBitmap function, but it looks like it doesn't even get called. I'm not sure how to go about fixing this. I can't find any examples of people actually using a custom ArtProvider, only examples of overwriting CreateBitmap.

Code:

    class CustomArtProvider(wx.ArtProvider):
    
        image_dir = myApp.image_dir
    
        def __init__(self):
            super(CustomArtProvider, self).__init__()
    
            # Attribs
            self.bmps = [os.path.splitext(bmp)[0]
                         for bmp in os.listdir(self.image_dir)
                         if bmp.endswith(".png") or bmp.endswith(".jpg")]
            # print self.bmps #  ['Stop', 'Play']
    
            def CreateBitmap(self, id,
                             client=wx.ART_OTHER,
                             size=wx.DefaultSize):
                print "Create Bitmap"  # never called
                # Return NullBitmap on GTK to allow the default
                # artprovider to get the system theme bitmap.
                if wx.Platform == '__WXGTK__':
                    return wx.NullBitmap
    
                # Non GTK Platform get custom resource
                # when one is available.
                if id in self.bmps:
                    path = os.path.join(self.image_dir, id+'.png')
                    bmp = wx.Bitmap(path)
    
                return bmp
    
    
    # In my frame
    def AddBasicTool(self, toolbar, label, description, imgId, handler):
        """Add a basic tool to a given toolbar."""
        img = wx.ArtProvider.GetBitmap(imgId, size=self.ICON_SIZE)
        tool = toolbar.AddSimpleTool(-1, img, label, description)
        self.Bind(wx.EVT_MENU, handler, tool)
    
    def __CreateToolBar(self):
        """Creates and sets up a toolbar."""
        toolbar = self.CreateToolBar()
    
        self.AddBasicTool(toolbar, "Load", "Load RFview Scenario",
                          wx.ART_FILE_OPEN, self.OnLoadScenario)  # WORKS AS EXPECTED
        self.AddBasicTool(toolbar, "Load", "Load RFview Scenario",
                          "Play", self.OnLoadScenario)  # NOTHING DISPLAYS
    
    # My App
    class MainApp(wx.App):
        def OnInit(self):
            # Push a custom ArtProvider onto the provider stack.
            wx.ArtProvider.PushProvider(CustomArtProvider())
            # Setup out main frame
            self.frame = MainFrame(None)
            self.frame.Show()
            return True

[Noah]

CreateBitmap was over indented so it was in the __init__. Stupid mistake on my part.