how to end manually positioning contour labels?

I just played with putting contour labels on manually (and interactively).

It works fine by just left clicking on the spot where you want a label.

But how do you end this feature? The doc string says: right click, or potentially click both mouse buttons together.

Neither works for me on win32, mpl 0.98.3, TkAgg backend, interactive mode.

Does this work for anybody?


Quick test:
cobj = contour(x,y,z) # x,y,z some arrays