'Set bitmap for the iconified widget to BITMAP. Return
the bitmap if None is given.
Under Windows, the DEFAULT parameter can be used to set the icon
for the widget and any descendents that don\'t have an icon set
explicitly.  DEFAULT can be the relative path to a .ico file
(example: root.iconbitmap(default=\'myicon.ico\') ).  See Tk
documentation for more information.'

def wm_iconbitmap(self, bitmap=None, default=None):

    if default:
        return self.tk.call('wm', 'iconbitmap', self._w, '-default', default)
    else:
        return self.tk.call('wm', 'iconbitmap', self._w, bitmap)
