I could obtain the world co-ordinates if  I use plframe . However if  I use Plplotwin object,
 I am not able to obtain these values,  the reason is that I am not able to correctly bind
the Plplotwin object.
for example, in this code:          
bind .p <Button-1> {
   get_coords %x %y
proc get_coords {g h} {
    puts "world coordinates: [.p report wc $g $h]"
If .p is a plframe object it works but not if it is a Plplotwin object. The "report" option is giving the
'bad option' error. Could you please suggest any work around for this.