DropDownTreeExpandEvent

Represents the object of the onExpandChange DropDownTree event.

Name	Type	Default	Description
item	any		The data item that was expanded or collapsed.
level	number[]		The hierarchical index path to the item.
nativeEvent	Event		A native DOM event.
syntheticEvent	SyntheticEvent<HTMLElement>		A React SyntheticEvent.
target	DropDownTreeHandle		An event target.