I need to add displayFormat to my measure in code as shown below.  Unfortunately it doesnt work....
What am I doing wrong?
The displayformat is correct when the measure is quantity but not when the measure is PctMktValue

http://help.infragistics.com/Help/NetAdvantage/WPFDV/2011.1/CLR4.0/html/xamPivotGrid_US_Defining_Hierarchies_And_Providing_Metadata_With_FlatData.html
http://community.infragistics.com/forums/t/69498.aspx

private void OnMeasureChanged(object sender, RoutedEventArgs e)
        {
            RadioButton radio = sender as RadioButton;
            ExposureGrid.DataSource.Measures.Clear();
            FilterHelper.FlatDataSource.CubesSettings.Clear();
           
            ExposureGrid.LayoutLoaded += new EventHandler<EventArgs>(ExposureGrid_LayoutLoaded);
            ViewModel.IsQuantityView = radio.Content.ToString() == "Quantity";
            string measureName = "Qty";
            string displayformat = "{}{0:#,#;(#,#)}";

            if (!ViewModel.IsQuantityView)
            {
                measureName = "PctMktValue";
                displayformat = "{}{0:#,#.##%;(#,#.##)%}"; // dosnt work
            }
           
            IMeasureViewModel measure = ExposureGrid.DataSource.CreateMeasureViewModel(ExposureGrid.DataSource.Cube.Measures[measureName]);
            DimensionMetadata dmd = new DimensionMetadata { DisplayFormat = displayformat, SourcePropertyName = measureName };
            CubeMetadata cmd = new CubeMetadata {DataTypeFullName = typeof(ExposureItem).FullName };
            cmd.DimensionSettings.Add(dmd);
            ExposureGrid.DataSource.Measures.Add(measure);
            ((FlatDataSource)ExposureGrid.DataSource).CubesSettings.Add(cmd);
        }