%w to expand the widget path.
| Method Name | Why |
|---|---|
| helpCallback | The help key is pressed. |
| destroyCallback | The widget is destroyed. |
When the Help() action occurs, either through the Help (usually <F1>) key or by a virtual binding, Motif looks for a callback to execute in the current widget. If it finds none, it looks in the parent, the parent's parent, and so on up to the main window. Hence, helpCallback may be used to implement a general or context-sensitive help facility.
The destroyCallback method can be used to call some automatic cleanup procedure when a widget is deleted.