....as far as auto-resizing goes, resizing the mainwindow is usually a bad option..... what you should do, is pack your buttons in a Scrolled Pane, and let the scrolled pane adjust the size of the scroll region to accomodate extra buttons......or look at the following

#!/usr/bin/perl
use strict;
use Tk;

my $mw = tkinit;

my %cb;
my $f = $mw->Frame->pack(-anchor => 'w');
foreach (qw/Author Reviewer File Status Mine/) {
    $cb{$_} = $f->Checkbutton(-text => $_)->pack(-anchor => 'w');
}

my $on_off = 1;
foreach (['Enable', 1], ['Disable', 0]) {
    $mw->Radiobutton(
-text     => $_->[0],
-command  => [\&ChangeAuthor, $_->[1]],
-variable => \$on_off,
-value    => $_->[1],
    )->pack(-side => 'left');
}

MainLoop;

sub ChangeAuthor {
    if (shift) {
$cb{Author}->pack(-before => $cb{Reviewer}, -anchor => 'w');
    } else {
$cb{Author}->packForget;
    }
}
[download]

I am curious what would give you that idea? pack() is the most used (far and away) geometry manager. I see nothing in your application that would require "grid". My advice: Learn how to use pack() before trying one of the other geometry managers.

One very common problem is not using enough frames. You seem to get the idea that frames can be packed inside of other frames. This is VERY common and the right way of using pack(). In my experience things like "place(-x => 100, -y => 11);", using "fixed" x,y coordinates is a bad idea, especially with some dynamic geometry things like varying the number of widgets that will be displayed.

If you want say 2 columns, make a frame for the columns, then a frame for col 1 and col 2. Pack widgets into say the left side of the column frames (also could be right or center). In this case -padx, -pady are good things to know about as well as fill.

I have found that the most helpful thing is to draw a simple diagram on paper of what you are trying to do, showing the frames and frames within frames, etc. All windows are pretty much the same except that a mainwindow will always exist (closing mainwindow exits Tk). You can hide or iconify the main windows, but it will still "exist".

I think you have a mis-understanding of what geometry() does. This IS the minimum window size! If you do the frame packing right, the window will expand. Awhile ago, I wrote a simple program to demo to show that the main window will grow at Re: Perl Tk geometry problem. Play with that simple code and you will see that you can't make the window smaller than this geometry value. I don't know of anything like "maxsize".

If the stuff to get display won't fit on screen, then as another poster suggested, scrolled is a good method. But I don't think that you need this.

I think you are getting warnings that you aren't seeing. I echo comments about "use strict; use warnings;".

My suggestion would be to come back with some code using only the standard geometry manager (pack). Make this as simple as you can to demonstrate the problems.

It is not clear to me whether you need to change this mainwindow set of buttons dynamically during course of program execution. You could clarify that requirement. Anyway the first step is to get some stuff on the screen like you want. Get that working. Then 2nd question is how to "re-do" this window with more or fewer buttons during course of program execution.

Update: I wrote some simple code for you to get started..

# Creating the Main Window
    $mainwindow = MainWindow->new(-title => " Select Fuel Tank for $Fu
+el_Type Fuel ");
[download]

# Defines the Geometry for the Main Window

   $mainwindow->geometry("400x300");
$mainwindow->maxsize(400,500;
    $mainwindow->minsize(400,300);
[download]

You really have many many issues here, first, your debugging would be a lot easier if you write these two line at the top of every Perl program..

use strict;
use warnings
[download]

a second thing, your indentation style is extremely hard to follow.
a third issue, you're mixing many grid managers, which may not be the best thing to do, look at the end of the bottom of the second block of code you posted and you'd see that there's a "pack" followed by a "place".. take a look at "Tk::Adjuster" documentation...I really want to spend a great deal of time solving this but you may want to consider these advices I just gave you In addition to the other valuable advices that all the monks replying to your post have contributedd.

---

Excellence is an Endeavor of Persistence. Chance Favors a Prepared Mind.

Hmm. If you set the max size to 400,500, then that will make it mighty difficult for the window to expand.
Missing a close bracket will also make it mighty difficult to compile.