When using

wm overrideredirect . yes

bind actions seems not to work. Anyway if I bind them to '.', the frame
generated in '.' or to 'all'. If using window decorations by commenting
out the above line, bind actions work fine.

Is there a way to make them work in the case without window decorations
as well?

I can only post some code that I have that works (under Linux) and you can
see where yours differs in implementation.

This code is supposed to give an icon button at top left of screen and it
has context menu attached.

HTH

     Rob.

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#!/bin/sh
# \
exec wish "$0" ${1+"$@"}

package require Img

wm overrideredirect . 1

set imgfile "/usr/share/icons/favicons/skype.png"
image create photo img -file $imgfile

set fraBorderWidth 2
frame .f -borderwidth $fraBorderWidth
set frameDefaultColour [.f cget -background]
pack .f
button .f.b -image img -relief raised -borderwidth 4
pack .f.b

set contextMenu [menu .popmenu -tearoff 0]
$contextMenu add command -label "Quit" -accelerator "Alt+F4" -command {exit}
$contextMenu add separator
$contextMenu add command -label "Properties..." -command {}