class_docstr: A list of checkboxes with extra annotation, and a context menu.
  
  Designed as an alternative to NameSubscriberCombobox which simplifies selection of
  multiple items.
code: def force_refresh(self, evt):
      evt.refresh_now = True
      for cb in self.callbacks:
          cb(evt)
  
imports: import platform
  import wx
label_desc: Use image node_id 6 for calling the NameSubscriberListBox obj's underlying member method code with example usage: obj.force_refresh(evt) without return types