How to delete wiboxes

[Csaba Dunai]

Hi

I have found your explanation on how to delete wiboxes at:
http://www.mail-archive.com/awesome@naquadah.org/msg00721.html

I tried it with the following example:

--start example--

a = wibox({})
a.screen = 1
a.visible = true
a.ontop = true
a.x = 10
a.y = 10
a.width = 100
a.height = 100
a:set_bg("#ffa500")
a.screen = nil
a = nil

--end example--

However the wibox remains where it is. What am I doing wrong? Has the way
of deleting wiboxes changed in the meanwhile?

My awesome version is:

awesome v3.5.1 (Ruby Tuesday)
 • Build: Apr  1 2013 19:51:47 for x86_64 by gcc version 4.7.2 (nobody@copy)
 • Compiled against Lua 5.2.1 (running with Lua 5.2)
 • D-Bus support: ✔

Kind regards