An object containing the orientation and state of the group. Structure:
areChildGroupsIgnored [type: Boolean] - A value indicating whether the any child groups contained should be ignored.
is2D [type: Boolean] - A value indicating if the group is 1D or 2D.
isCollapsed [type: Boolean, mayBeNull: true] - A value indicating whether the group is collapsed, if it is 1D.
orientation [type: dundas.controls.Orientation, mayBeNull: true] - The orientation of the group, if it is 1D.