def __init__(self, parent, *args, **kwargs): Sidebar.__init__(self, parent) ProjectTree.__init__(self, parent, None, size=(self.classprefs.best_width, self.classprefs.best_height)) self.isBusy = 0 self.start_busy = None self.progress = None self.timer = None self.Bind(wx.EVT_TIMER, self.OnTick)