I am facing a problem when HorizontalScrollBarVisibility="Visible" OR HorizontalScrollBarVisibility="Auto" of ScrollViewer object is set then Grid column width is not working and giving unexpected result.

Here my control XAML.

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" xmlns:igGrid="clr-namespace:Infragistics.Silverlight.Controls;assembly=Infragistics.Silverlight.XamWebGrid.v10.1" x:Class="SilverlightApplication3.MainPage"
    >
    <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
        <Grid x:Name="LayoutRoot"  MinWidth="600" MinHeight="350">
           
            <igGrid:XamWebGrid x:Name="myGrid"  ScrollViewer.HorizontalScrollBarVisibility="Hidden" ScrollViewer.VerticalScrollBarVisibility="Hidden"  AutoGenerateColumns="False" d:LayoutOverrides="Width, Height" Height="110" VerticalAlignment="Top"/>
           
        </Grid>
    </ScrollViewer>
</UserControl>

and Here is my Code Behind file.

public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            List<CustomClass> lst = new List<CustomClass>();
            for (int i = 0; i < 15; i++)
            {
                lst.Add(new CustomClass { Name = "Name " + i.ToString(), Val1 = i.ToString(), Val2 = i.ToString() });
            }
            TextColumn tc1 = new TextColumn();
            tc1.Key = "Name";
            tc1.Width = new ColumnWidth(0.5, true);
            TextColumn tc2 = new TextColumn();
            tc2.Key = "Val1";
            tc2.Width = new ColumnWidth(0.25, true);
            TextColumn tc3 = new TextColumn();
            tc3.Key = "Val2";
            tc3.Width = new ColumnWidth(0.25, true);
            myGrid.Columns.Insert(0, tc1);
            myGrid.Columns.Insert(1, tc2);
            myGrid.Columns.Insert(2, tc3);
            myGrid.UpdateLayout();
            myGrid.ItemsSource = lst;
        }
    }
    public class CustomClass
    {
        public string Name { get; set; }
        public string Val1 { get; set; }
        public string Val2 { get; set; }
    }

Here is the output????

is it a bug in Grid? Kindly reply me soon as I will have to take decision soon. Thanks

Best Regards,