GanttColumnHeaderFilterBuilder.GroupInterval Method

Name	Parameters	Description
GroupInterval(HeaderFilterGroupInterval)	value	Specifies how the header filter combines values into groups. Does not apply if you specify a custom header filter data source. Mirrors the client-side groupInterval option.
GroupInterval(JS)	value	Specifies how the header filter combines values into groups. Does not apply if you specify a custom header filter data source. Mirrors the client-side groupInterval option.
GroupInterval(Double)	value	Specifies how the header filter combines values into groups. Does not apply if you specify a custom header filter data source. Mirrors the client-side groupInterval option.