The containing frame must fill 'x': 

my $fA = $mw->Frame->pack(-side => 'bottom', -fill => 'x');

[download]

In such cases it is helpful to construct the container with a different background colour (or with a border) to see its limits.

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re: Get a Tk Button to align left in a frame by shmem
in thread Get a Tk Button to align left in a frame by ff

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