'Launch a gitk-like viewer on the selection revision'

def viz_revision(self):

    revision = self.revision.text()
    if (not revision):
        qtutils.information(N_(u'No    Revision    Specified'), N_(u'You    must    specify    a    revision    to    view.'))
        return
    cmds.do(cmds.VisualizeRevision, revision)
