This topic lists the Extender events that are available when the Image Annotation Tool Button control is drawn on a Visual Basic form.
| Name | Description |
| Click | Fires when a user presses and then releases a mouse button over an object |
| DragDrop | Fires when a drag-and-drop operation is completed. |
| DragOver | Fires when a drag-and-drop operation is in progress |
| Error | Fires when an error occurs |
| GotFocus | Fires when an object receives focus |
| KeyDown | Fires when a user presses a key while the object has focus |
| KeyPress | Fires when a user presses and then releases a key while the object has focus |
| KeyUp | Fires when a user releases a key while the object has focus |
| LostFocus | Fires when an object loses focus |
| MouseDown | Fires when a user presses a mouse button |
| MouseMove | Fires when a user moves the mouse |
| MouseUp | Fires when a user releases a mouse button |
Refer to the Visual Basic on-line help for more information about these events.