February 14, 2014
Gets or sets a converter to apply to the property value or the item to produce the final value that is used to determine which group(s) an item belongs to.
Assembly: System.Windows (in System.Windows.dll)
To change the value that is eventually used for grouping before the groups are generated, use the property to supply a value converter. For example, you might want to group items based on the first letter of a name. If the PropertyName property is not set, the item itself is passed to the value converter. The converter can return a collection, which indicates that the items can appear in more than one group.