I don't know if Tkx is the same (I suspect it would be), but in Perl::Tk there is the "callback" (see Tk::callbacks), an array reference that encapsulates a function reference and a set of aguments:

c:\@Work\Perl\monks>perl -wMstrict -le
"use constant Y => 'bar';
 ;;
 my @callbacks;
 ;;
 my $z = 9;
 ;;
 for (my $x = 1;  $x < 4;  $x++) {
   push @callbacks, [ \&foo, $x, Y, $z-- ];
   }
 ;;
 $z = 'zero';
 ;;
 $_->[0]->(@$_[ 1 .. $#$_ ]) for @callbacks;
 ;;
 sub foo { print qq{@_}; }
"
1 bar 9
2 bar 8
3 bar 7
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(Don't worry about the messy  $_->[0]->(@$_[ 1 .. $#$_ ]) stuff in the example; that's all taken care of under the hood in Tk and is only intended to illustrate the principle.)

Update: Changed example code to include  $z variable.