Public Property Parent As ExpressionInfo

public ExpressionInfo Parent {get; set;}

Property Value

This property only applies if the group has exactly one group expression

Indicates the following:

1. Groups are sorted according to the recursive hierarchy (sort is still used to sort peer groups).
2. Labels (in the document map) are indented according to the recursive hierarchy.
3. Intra-group show/hide toggles items according to the recursive hierarchy (see ToggleItem).

If filters on the group eliminate the parent of a group instance, it is instead treated as a child of the parent's parent.

Reference