code: def add_field(self, key, field):
          
          self.inputs[key] = field
          container = HBox()
          container.style.update({'justify-content':'space-between', 'overflow':'auto', 'padding':'3px'})
          container.append(self.inputs[key], key=key)
          self.container.append(container, key=key)
docs: Adds a field to the dialog with a unique identifier.
  
          Note: You can access to the fields content calling the function GenericDialog.get_field(key).
  
          Args:
              key (str): The unique identifier for the field.
              field (Widget): The widget to be added to the dialog, TextInput or any Widget for example.