Creates a new group and appends it to the collection.
NuGet Packages: DevExpress.PivotGrid.Core, DevExpress.Win.Dashboard.Design
A PivotGridGroup object which represents the group that was added.
The Add method creates a new group with default settings, adds it to the end of the collection and returns the new group. Also, see the other overloads of the Add method which take different parameters. To add several groups to the collection use the PivotGridGroupCollection.AddRange method.