Starting from an example off the web, I want to add these two lines so that they are left justified and vertical to each other. I've missed something. Attached is the complete program - I am just curious on how to fix the "Model File" and the "Range File" widgets. I know there are other issues...

#!/usr/bin/perl -w

use Tk;
use strict;

# **********************
# Main()
# **********************

my(
  $entry,
  $filename,
  $output,
  );

my $ver = "1.0.0";

my $mw = MainWindow->new;
$mw->geometry("500x600");
$mw->title("GUI 6");

my $main_menu = $mw->Menu();
$mw->configure(-menu => $main_menu);

# give the user a way to exit the script
my $file_menu = $main_menu->cascade(-label=>" ", -underline => 0, -tea
+roff=>0);
$file_menu->command(-label=>"Exit", -underline=>0, -command => sub{exi
+t});

# everyone needs a little help
my $help_menu = $main_menu->cascade(-label => "Help", -underline => 0,
+ -tearoff => 0);
$help_menu->command(-label => "Version", -underline => 0,
                    -command => sub{$mw->messageBox(-message => "Versi
+on: $ver",
                                                    -type => "ok")});
$help_menu->command(-label => "About Program", -underline => 0, -comma
+nd => \&show_about);


my $pet_info_frame = $mw->Frame()->pack(-side => "top");
$pet_info_frame->Label(-text => "View?")->pack(-side => "top");
my $chk1 = "no";
my $chk2 = "no";
my $pet1_chk = $pet_info_frame->Checkbutton(-text => "Show All",
                                            -variable => \$chk1,
                                            -onvalue => "yes",
                                            -offvalue => "no")->pack(-
+side => "right");
my $pet2_chk = $pet_info_frame->Checkbutton(-text => "Show Only Differ
+ences",
                                            -variable => \$chk1,
                                            -onvalue => "yes",
                                            -offvalue => "no")->pack(-
+side => "right");


my $model_info = $mw->Frame()->pack(-side => "left");
$model_info->Label(-text => "Model File : ")->pack(-side => "left");

my $model_info_frame = $mw->Frame()->pack(-side => "left");


my $entry1 = $model_info_frame->Entry(
    -width => 60,
    -textvariable => \$filename
)->grid(
    $mw->Button(
       -text => "...",
       -command => sub {
        $filename = $mw->getOpenFile(-title => 'File Browser');
       }
     ),
);
$model_info = $mw->Frame()->pack(-side => "left");

my $range_info = $mw->Frame()->pack(-side => "left");
$range_info->Label(-text => "Range File : ")->pack(-side => "left");

my $range_info_frame = $mw->Frame()->pack(-side => "left");

my $entry2 = $range_info_frame->Entry(
    -width => 60,
    -textvariable => \$filename
)->grid(
    $mw->Button(
       -text => "...",
       -command => sub {
        $filename = $mw->getOpenFile(-title => 'File Browser');
       }
     ),
);



my $button_frame = $mw->Frame()->pack(-side => "bottom");
$button_frame->Button(-text => "Ok", -command => \&update_output)->pac
+k();

#my $output_frame = $mw->Frame()->pack(-side => "bottom");
#my $output_scroll = $output_frame->Scrollbar();
#my $output_text = $output_frame->Text(-yscrollcommand => ['set', $out
+put_scroll]);

#$output_scroll->configure(-command => ['yview', $output_text]);

#$output_scroll->pack(-side => "bottom", -expand => "no", -fill => "y"
+);
#$output_text->pack();

sub update_output {

  if ( $chk1 eq "yes" ) { $output = "$output\nShow All"; }
  if ( $chk2 eq "yes" ) { $output = "$output\nShow Only Differences"; 
+}

  #$output_text->delete('0.0', 'end');
  #$output_text->insert("end", $output);
}

sub show_about {
  my $help_win = $mw->Toplevel;
  $help_win->geometry("300x50");
  $help_win->title("About Program");

  my $help_msg = "This help page is an example of using multiple windo
+ws.";
  $help_win->Label(-text => $help_msg)->pack();
  $help_win->Button(-text => "Ok", -command => [$help_win => 'destroy'
+])->pack();
}

MainLoop;
[download]

Any help appreciated. Thanks in advance.