right click on a background tab gives actions for current tab
which breaks the way FFOX and others tabbed ui programs. there was a recent conversation in pygtk ml about such issue (catching click on tab_label [NOTE: it's not a gtklabel]) and I think he endedup with eventbox? [not sure though because we have all that in a hbox]
anyways this should be fixed by making the aciontson the bg tab refer to the bg tab