pygtk: gtk.CellRendererText().set_property(...) and pango markup (HTML)

[Marek Kozlowski <kozlowsm mini pw edu pl>]

:-)
I've been reading documentation several times and I cannot find it :-(
I call:

	cell = gtk.CellRendererText ()
	cell.set_property ('cell-background', '#eeeeee')
	cell.set_property (....

I'd like all text rendered using this CellRendererText object to be
interpreted as an HTML, that is all <b>, <i> etc to change style of the
text between such tags. What property does it? 'markup' is described
quite misteruoisly :-(

Thanks in advance,
best regards,
Marek