[ns] NAM not working after ns-2.33 installation

[Kanwal Gheek]

I installed ns-2.33 and everything did go ok. But after installation though ns was working fine, nam wasn't working. When I ran nam it gave me the following error - 

$ nam:
[code omitted because of length]
: no event type or button # or keysym
     while executing
"bind Listbox <MouseWheel> {
%W yview scroll [expr {- <%D / 120> * 4}] units
}"
      invoked from within
"if {[tk windowingsystem] eq "classic" || [tk windowingsystem] eq "aqua"} {
%W yview scroll [expr {- <%D>}] units
}
bind Li..."

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I found out that there is no workaround on cygwin.
Any help in this regard will be highly appreciated.
Thanks.
Kanwal.