GroupKey

Represents the default format in which the kendoGridExpandGroupBy directive persists the expanded group keys (see example).

Determining whether a group is expanded or collapsed is done by comparing all of the following field values.

Name	Type	Default	Description
field	string		Represents the field property value of the current group item.
parentGroupKeys?	{ field: string; value: any; }[]		An array of { field: string, value: any } items indicating all parent groups of the current one, staring from the direct parent group all the way to the root level one. See example.
value	any		Represents the value property value of the current group item.