Regarding get-mouse-x-coordinate and get-mouse-y-coordinate ??

Could anybody please ensure me is get-mouse-x-coordinate and get-mouse-y-coordinate is working in Breve? I have to add little code here as an example. But it is not able to take the simulation window click position(Where in simulation window I clicked on).
+ to click on item (object):
x (float).
y (float).
#if selection: selection hide-neighbor-lines.
#if item: item show-neighbor-lines.

#selection = item.

print " ##################### is mouse click is working ##########".
x = item get-mouse-x-coordinate.
y = item get-mouse-y-coordinate.
print " ########### x position is ##### $x".
print " ########### y position is ##### $y".
#super click on item.
If any advice or information regarding this code will be helpful for me.If you know or have an example regarding this code please inform me?

Thanks.
JK