Is there a method to have Tk::Optionmenu start displaying the option list without having the user first click the button?

Question 2: Why does the Optionmenu callback function (localCall below) get called before the user click of Optionmenu button? Please look at my workaround.

Thanks

!/usr/bin/perl -w
use strict;
use warnings;
# teest Tk::Menuoption

use Tk;
use Tk::Optionmenu;

my $mw = new MainWindow;

my $baseFrame = $mw->Frame()->pack(
                -side=>'top',
                -fill=>'both',
                -expand=>0);
my $name_text = "phone name";
my $phoneNo = 51206;
$baseFrame->Button(-text=>$phoneNo,
                    -relief=>'flat',
                    -cursor=>'hand1',
                    -activeforeground=>'blue',
                    -activebackground=>'white',
                    -command => sub {phoneCmds(
                                    $baseFrame,
                                    $phoneNo);},
                    )->pack(-side=>'left');

my $cmdsFrame;
my $cm;
sub phoneCmds {
    my (
        $baseFrame,
        $caller,
    ) = @_;
    my $deviceDN = $caller;
    print "caller(deviceDN)=$deviceDN\n";
    
    $cmdsFrame = $baseFrame->Frame( )->pack(
                            -side=>'left',
                            -fill=>'both',
                            -expand=>0);
    
    my @callees = qw/46001 46002 46003 46004/;
    my $callee;
    $cm = $cmdsFrame->Optionmenu(-
        -variable =>\$callee,
        -options => [@callees],
        -command => [\&localCall, $caller],
    );
    $cm->pack();
    
}


sub localCall {
    my (
        $caller,
        $callee,
    ) = @_;
    return if !defined($callee);
    return if !defined($cm);
    
    print "localCall: caller=$caller callee = $callee\n";
    $cm->destroy() if $cm && $cm->exists();
    $cm = undef;
    $cmdsFrame->destroy() if $cmdsFrame && $cmdsFrame->exists();
#    $cmdsFrame = undef;
}



MainLoop;
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