function HbOrdScope( nScope: Integer; expNewValue: Variant ): Variant; overload;
Description
Sets the new range (scope) value for dataset to expNewValue.
If nScope is 1 - scope start (top) value is set
If nScope is 2 - scope end (bottom) value is set
Returns the old scope (range) value for dataset.
Set scope value to '' to clear the scope.