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.

def add_field(self, key, field):
        """
        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.
        """
        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)