code: def _tree_stat(self, mode, infostr, stat):
          
          action_str = mode.upper()
          info_str = infostr
          if stat == 'OK':
              self.action_st_panel.SetBackgroundColour('#00FF00')
          else:  # ERR
              self.action_st_panel.SetBackgroundColour('#FF0000')
          self.action_st.SetLabel(action_str)
          if info_str is None:
              pass
          if stat == 'OK':
              child_cnt_0 = self.mainview_tree.GetChildrenCount(
                  self.mainview_tree.GetRootItem(),
                  recursively=False)
              child_cnt_1 = self.mainview_tree.GetChildrenCount(
                  self.mainview_tree.GetRootItem(),
                  recursively=True)
              self.info_st.SetLabel("{0} ({1} elements.)".format(info_str, child_cnt_0))
              self.log.append({'stat': stat,
                               'logstr':
                                   "[{ts}] {acts:<10s} : {infs} ({cnt1}|{cnt2})".format(
                                       ts=time.strftime("%Y/%m/%d-%H:%M:%S",
                                                        time.localtime()),
                                       acts=action_str,
                                       infs=info_str,
                                       cnt1=child_cnt_0,
                                       cnt2=child_cnt_1), })
          else:
              self.info_st.SetLabel("{0} (0 elements.)".format(info_str))
              self.log.append({'stat': stat,
                               'logstr':
                                   "[{ts}] {acts:<10s} : {infs} ({cnt1}|{cnt2})".format(
                                       ts=time.strftime("%Y/%m/%d-%H:%M:%S",
                                                        time.localtime()),
                                       acts=action_str,
                                       infs=info_str,
                                       cnt1=0,
                                       cnt2=0), })
  
          if self.info_st.IsEllipsized():
              self.info_st.SetToolTip(wx.ToolTip(info_str))
docs: update stat regarding to tree generating process,
              e.g. show_tree()