When overriden in a derived class the GetAllNames method receives an empty IEnumerable in the "parentGroupNames" parameter.

 

Add the ability to specify the start and end for the grouping. This functionality is available in MS Excel.

It seems that the option to turn of sums has no effect for hirachie columns.
No matter if this option is checked or not, they do not disappear.

It works on regular columns.

Allow creating a custom TotalFormat which can be used to format the cell values.

A sample scenario where this will be useful is if you want to show both the absolute and percentage value of the cells. 

GroupNode is the type of the RowGroup and ColumnGroup properties of the CellAggregateValue class. Its Group property is useful to construct a new Coordinate object and use it in the GetAggregateResult() method. However, currently the GroupNode class is internal, therefore you cannot access its Group property. Allow access to the GroupNode class, or provide another way to access its Group. 

I've been investigating a memory leak in my application and I've noticed that there are a lot of TypeBuilders and RuntimeTypes hanging around, and this number increases over time. Investigation into this shows that they are being held onto by the ModuleBuilder instance in the static instance of the Telerik PivotClassFactory.

Currently - any string can be typed in the combobox which is displayed as the editor for the label filters. The input should be limited to only the values present in the ItemsSource collection. 

InvalidOperationException regarding QuickStyle Freezable is thrown when the control is opened in new STA thread.

In OLAP you are able to define ragged hierarchies. In a ragged hierarchy, the logical parent member of at least one member is not in the level immediately above the member. This can cause branches of the hierarchy to descend to different levels. RadPivotGrid doesn't show them correctly.

Currently the header of that column says "Grand Total" instead of the aggregate name.

Available in LIB version 2015.2.914, it will be also available in the 2015 Q3.

Implement sorting by clicking on headers, like in RadGridView.
Unfortunately for Telerik, Infragistics have this feature:
http://help.infragistics.com/Help/Doc/WPF/2015.1/CLR4.0/html/xamPivotGrid_US_Sorting_Data.html