| Name | Type | Defined Value |
| None | Not occurs | WSEV_NONE |
| INITIALIZE | When the instance is initilized. | WSEV_INITIALIZE |
| DELETE | When the instance is released. | WSEV_DELETE |
| VALUE-CH | When the value is changed. | WSEV_VALUE_CH |
| VISIBLE-CH | When the WSNvis property is changed. | WSEV_VISIBLE_CH |
| PARENT-VISIBLE-CH | When the visible property of the parent instance is changed. | WSEV_PARENT_VISIBLE_CH |
| EXPOSE | When the instance is exposed. | WSEV_EXPOSE |
| RESIZE | When the instance is resized. | WSEV_RESIZE |
| MOUSE-IN | When the mouse pointer comes into the area | WSEV_MOUSE_IN |
| MOUSE-OUT | When the mouse pointer goes out of the area. | WSEV_MOUSE_OUT |
| MOUSE-PRESS | When the mouse pointer is pressed. | WSEV_MOUSE_PRESS |
| MOUSE-RELEASE | When the mouse pointer is released. | WSEV_MOUSE_RELEASE |
| MOUSE-MOVE | When the mouse pointer moves in the area. | WSEV_MOUSE_MOVE |