This demonstrates the use of show and hide
functionality via Show/Hide_Button and
Show/Hide_Menu_Item postMessage events.

Save and Print buttons and menu items are
controlled in the demo.

Change-Id: I81dfea816765da50a1c20699b460765ae35f60a6
Reviewed-on: https://gerrit.libreoffice.org/74130


Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>
(cherry picked from commit 89ae4278)
Reviewed-on: https://gerrit.libreoffice.org/82704


Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>