I got some help elsewhere for this. Needed to read (and understand) the ttk::entry manual page. Using a Tkx::Ev event in the -validatecommand is new to me.

Here is a revised script that prints out all the information described in the ttk::entry man page. The $P parameter is the one I'm interested in.

use strict;
use Tkx;
Tkx::package_require("tile");
Tkx::package_require("style");

my $mw = Tkx::widget->new(".");
my $text = "abc";
my $entry = $mw->new_ttk__entry(-width => 20, -textvariable => \$text)
+;
$entry->configure(-font => "helvetica 14 bold");
$entry->g_grid(-column => 0, -row => 0, -sticky => 'w');
# $entry->configure(-validate => 'all', -validatecommand => \&Entry);
$entry->configure(-validate => 'all', -validatecommand => \&Entry);
# $entry->configure(-validatecommand => [\&Entry, Tkx::Ev('%P'), $entr
+y]);
#$entry->configure(-validatecommand => [\&Entry, Tkx::Ev('%d', '%i', '
+%P', '%s', '%S', '%v', '%V', '%W'), $entry]);
$entry->configure(-validatecommand => [\&Entry, Tkx::Ev('%d', '%i', '%
+P', '%s', '%S', '%v', '%V', '%W'), $entry]);

Tkx::MainLoop();

sub Entry
{
    my ($d, $i, $P, $s, $S, $v, $V, $W) = @_;

    print "action               = '$d'\n";
    print "index                = '$i'\n";
    print "new value            = '$P'\n";
    print "current value        = '$s'\n";
    print "insert string        = '$S'\n";
    print "validate option      = '$v'\n";
    print "validation trigger   = '$V'\n";
    print "widget name          = '$W'\n";
    return 1;
}
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David