Simple question on X/Y to Lat/Lon

Hi ,

I have a very simple question. I want to create a "Custom icon"
which is rectangular in shape and has a length, breadth of say
l,b pixels. The user can select this icon say through a menu.
After selecting the icon he would place it on some LAT/LON
position(mouse click). I have to display a dialog showing some text
information
based on the rectangular area now selected.
Assuming that i create a new MouseMode for this purpose..

What i would like to know is
What are the steps required to
1)Find out which LAT/LON was clicked.?
2)based on l,b what is the LAT/LON area selected.?

thx in advance
rajesh.m

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