ItemExpanding (Key)| Function Name | c:<CONTROL-NAME>#OnItemExpanding |
|---|---|
| Syntax | (defun c:<CONTROL-NAME>#OnItemExpanding
(Label [as String] Key [as
Handle or
String] /) |
| Return Type | Ignored |
| Applies To | Tree |
This event is triggered when the specified item is about to expand or collapse. Label is the expanding or collapsing item's label. Key identifies the item; it is a string if the control uses string keys; otherwise it is a unique handle that identifies the item.