Plottin A Single Point?!?

Hello NG,

    I am trying to plot a series of point (in a wxPython window). Everything
works if I plot all the points together, as:

myreference = plot(x, y, 'ko')

But I would like to plot 1 point at a time, and to keep a "plot reference"
of every point, because I will have to be able to interact with every single
point (and not with all of them) separately, using the mpl_connect functions.
If I try to plot a single point, matplotlib/pylab returns me an error like:

  File "D:\MyProjects\globall\", line 169, in CreateWellMap
    mp = axdata.plot(xc[cc], yc[cc], "ko")
  File "C:\Python23\Lib\site-packages\matplotlib\", line 2324, in
    for line in self._get_lines(*args, **kwargs):
  File "C:\Python23\Lib\site-packages\matplotlib\", line 276, in
    yield self._plot_3_args(remaining, **kwargs)
  File "C:\Python23\Lib\site-packages\matplotlib\", line 238, in

Does anyone have a suggestion? Thank you very much.