http://www.tcl.tk/man/tcl8.5/TkCmd/frame.htm

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[Jeffrey Hobbs] has written, "The whole container/use idea is
nice, but was only pushed far enough to enable embedding Tk
into Netscape/IE.  There are definite problems with handling
focus and message passing ..."

So I guess it is up to the Tk community to jump in and improve this capability?
Let's use "[Combining GUI applications developed with Tk and 'native' Windows toolkits]"
as a home for such progress.

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**Frame does not shrink on 0 height of last children is unpacked/ungridded**

[HaO] 2016-09-07:
(issue is present with pack and grid and with freame and ttk::frame)

Giving a frame with two children:
======
pack [frame .f -height 1]
pack [entry .f.e1] [entry .f.e2]
======
When on children is unpacked, the frame resizes to the size required by the other children:
======
pack forget .f.e1
======
When the last children is unpacked, the frame does not resize:
======
pack forget .f.e2
======
-> The frame keeps the size of the entry widget.

To avoid this effect, there are two solutions on clt (Thread "frame auto resize to 0 if forgetting packed subwidget", date 2016-09-05):

***Solution 1: pack an invisible frame***
[bll]: Just pack a dummy frame in the collapsing frame:
======
pack [frame .f] [frame .f.d]
pack [entry .f.e1] [entry .f.e2]
======

***Solution 2: set -height of the frame to 1***
======
pack forget .f.e2
.f configure -height 1
======
This works without a dummy widget but shows a frame of height 1.

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   * [A scrolled frame]
   * [Scrolled.frame]
   * Note that 8.4 introduces a [labelframe]
   * [Frame Background Image]






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