Adds a field to the dialog together with a descriptive label and 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.
            label_description (str): The string content of the description label.
            field (Widget): The instance of the field Widget. It can be for example a TextInput or maybe
            a custom widget.

def add_field_with_label(self, key, label_description, field):
        """
        Adds a field to the dialog together with a descriptive label and 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.
            label_description (str): The string content of the description label.
            field (Widget): The instance of the field Widget. It can be for example a TextInput or maybe
            a custom widget.
        """
        self.inputs[key] = field
        label = Label(label_description)
        label.style['margin'] = '0px 5px'
        label.style['min-width'] = '30%'
        container = HBox()
        container.style.update({'justify-content':'space-between', 'overflow':'auto', 'padding':'3px'})
        container.append(label, key='lbl' + key)
        container.append(self.inputs[key], key=key)
        self.container.append(container, key=key)