Changing the mouse pointer to a cursor?

[Helper]

Hi,
I am using a graph or perhaps a polar plot, not sure yet, but I realy wanted to know if there is any way to make the mouse pointer act like a cursor, such that I can click on something on the graph and know where the mouse clicked (the coordinates) and perhaps change the appearance of the hand to something else? So I DO NOT have to use a cursor. I want the user to just click and not have to drag a cursor around.

[LBoltzmann]

Check out the Gtoolbox at gtoolbox.topcool.net. It has the functionality you are looking for.