How to use the gooey.gui.pubsub.pub function in Gooey

def __init__(self, base_frame, build_spec):
    '''
    :type base_frame: BaseWindow
    :type build_spec: dict
    '''
    self.core_gui = base_frame
    self.build_spec = build_spec

    # wire up all the observers
    pub.subscribe(self.on_cancel,   events.WINDOW_CANCEL)
    pub.subscribe(self.on_start,    events.WINDOW_START)
    pub.subscribe(self.on_restart,  events.WINDOW_RESTART)
    pub.subscribe(self.on_close,    events.WINDOW_CLOSE)
    pub.subscribe(self.on_edit,     events.WINDOW_EDIT)

self.SetDoubleBuffered(True)

    self.sidebar = Sidebar(self, contents=self._build_spec['widgets'].keys())

    self.config_panels = self.build_panels(self._build_spec)
    self.active_panel = self.config_panels.keys()[0]
    self.config_panels[self.active_panel].Show()

    sizer = wx.BoxSizer(wx.HORIZONTAL)
    sizer.Add(self.sidebar, 1, wx.EXPAND)
    sizer.Add(wx_util.vertical_rule(self), 0, wx.EXPAND)
    for panel in self.config_panels.values():
      sizer.Add(panel, 3, wx.EXPAND)
    self.SetSizer(sizer)

    pub.subscribe(self.load_view,   events.PANEL_CHANGE)

self._header = None
    self._subheader = None
    self._settings_img = None
    self._running_img = None
    self._check_mark = None
    self._error_symbol = None

    self.layouts = {}

    self._init_properties()
    self._init_components(heading, subheading)
    self._init_pages()
    self._do_layout()

    pub.subscribe(self.load_view, events.WINDOW_CHANGE)

def onClick(self, evt):
    pub.send_message(events.PANEL_CHANGE, view_name=evt.GetString())
    evt.Skip()

def onClose(self, evt):
    if evt.CanVeto():
      evt.Veto()
    pub.send_message(str(events.WINDOW_CLOSE))

def on_start(self):
    if not self.skipping_config() and not self.required_section_complete():
      return self.show_dialog(i18n._('error_title'), i18n._('error_required_fields'), wx.ICON_ERROR)

    cmd_line_args = self.core_gui.GetOptions()
    command = '{0} --ignore-gooey {1}'.format(self.build_spec['target'], cmd_line_args)
    pub.send_message(events.WINDOW_CHANGE, view_name=views.RUNNING_SCREEN)
    self.run_client_code(command)

# components
    self.cancel_button = None
    self.start_button = None
    self.running_animation = None
    self.close_button = None
    self.stop_button = None
    self.restart_button = None
    self.buttons = None

    self.layouts = {}

    self._init_components()
    self._init_pages()
    self._do_layout()

    pub.subscribe(self.load_view, events.WINDOW_CHANGE)

def onClick(self, evt):
    pub.send_message(events.PANEL_CHANGE, view_name=evt.GetString())
    evt.Skip()

sizer.Add(self.config_panel, 1, wx.EXPAND)
    else:
      self.config_panel = layouts.FlatLayout(self, build_spec=self.build_spec)
      sizer.Add(self.config_panel, 1, wx.EXPAND)

    sizer.Add(self.runtime_display, 1, wx.EXPAND)

    self.runtime_display.Hide()
    sizer.Add(wx_util.horizontal_rule(self), 0, wx.EXPAND)
    sizer.Add(self.foot_panel, 0, wx.EXPAND)
    self.SetSizer(sizer)

    self.sizer = sizer

    pub.subscribe(self.myListener, "panelListener")
    pub.subscribe(self.load_view, events.WINDOW_CHANGE)

self.config_panel = layouts.ColumnLayout(self, build_spec=self.build_spec)
      sizer.Add(self.config_panel, 1, wx.EXPAND)
    else:
      self.config_panel = layouts.FlatLayout(self, build_spec=self.build_spec)
      sizer.Add(self.config_panel, 1, wx.EXPAND)

    sizer.Add(self.runtime_display, 1, wx.EXPAND)

    self.runtime_display.Hide()
    sizer.Add(wx_util.horizontal_rule(self), 0, wx.EXPAND)
    sizer.Add(self.foot_panel, 0, wx.EXPAND)
    self.SetSizer(sizer)

    self.sizer = sizer

    pub.subscribe(self.myListener, "panelListener")
    pub.subscribe(self.load_view, events.WINDOW_CHANGE)