def METHOD_NAME(self, frame=None, expand=True, lastFrame=None):
    """Display a call stack and exception traceback.
    This allows the user to probe the contents of any frame in the given stack.
    *frame* may either be a Frame instance or None, in which case the current 
    frame is retrieved from ``sys._getframe()``. 
    If *tb* is provided then the frames in the traceback will be appended to 
    the end of the stack list. If *tb* is None, then sys.exc_info() will 
    be checked instead.
    """
    if frame is None:
        frame = sys._getframe().f_back
    self.clear()
    stack = stackFromFrame(frame, lastFrame=lastFrame)
    items = makeItemTree(stack, "Call stack")
    self.addTopLevelItem(items[0])
    if expand:
        items[0].setExpanded(True)