PopupStringFieldOption can be one of:
| Constant | Description | 
|---|---|
Enums. | (0) A single-line input box. | 
Enums. | (1) A multiline input box. | 
Enums. | (2) A rich text editor allowing for bold text, highlighting, and so forth. | 
Enums. | (-1) An unknown string field option. |