=head1 NAME

Tk::DropSite - Receive side of Drag & Drop abstraction

=for category User Interaction

=head1 SYNOPSIS

 use Tk::DropSite qw(...);
 $widget->DropSite(-entercommand => ...,
                   -dropcommand  => ...,
                   -motioncommand  => ...,
                   -dropcommand  => ...,
                  );

=head1 DESCRIPTION

C<DropSite> creates an object which represents a site on which things
may be "Dropped". 

A DropSite provides the following methods:
 
=over 4

=item $site->Enter($token,$event)

=item $site->Leave($token,$event)

=item $site->Motion($token,$event)

=item $site->Drop($token,$event)

=back 
