| Name | Value | Description |
| CriticalIconType | 4 | An icon indicating that a critical problem message is being displayed. |
| InformationIconType | 2 | An icon indicating that informational message is being displayed. |
| NoIconIconType | 0 | No icon is to be used. |
| QuestionIconType | 1 | An icon indicating that a question is being asked. |
| WarningIconType | 3 | An icon indicating that a warning message is being displayed. |