[Solved] Gridview performance problems

[Hector]

All of a sudden, my Gridview began having data loading performance issues, in a big way.  It was working fine, but I am not sure what it is I did that caused this behavior to happen.  I am using a NetRIA service to load my data, and the data is retrieved pretty fast, but for some reason, it is taking the GridView an extremely long time to load it.  It also take very long time to do a SelectAll on it.  Can anyone help me trouble shoot my app?  I am not sure what I a have done to break it.  Here is a snipet of code of where I am laoding the data:

    public partial class GridViewTest : UserControl
    {
        public GridViewTest()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(GridViewTest_Loaded);
        }

        void GridViewTest_Loaded(object sender, RoutedEventArgs e)
        {
            // NetRIA proxy
            PortalDomainContext portalDomainContext = new PortalDomainContext();
            LoadOperation<ValidValue> lo = portalDomainContext.Load(
                portalDomainContext.GetValidValuesQuery(247, 154,
                3, 8), GetValidValuesComplete, null);
        }

        private void GetValidValuesComplete(LoadOperation<ValidValue> lo)
        {
            if (!lo.HasError)
            {
                radGridView1.ItemsSource = lo.Entities;
            }
        }

        private void checkSelall_Checked(object sender, RoutedEventArgs e)
        {
            if (checkSelall.IsChecked == true)
            {
                radGridView1.SelectAll();
            }
            else
                radGridView1.UnselectAll();
        }
    }

[Hector]

I found the problem by pure chance.  It happens that my grid was inside of a StackPanel and becase a stack panel auto grows, it will return all the rows at once.  I put it in a grid and set a fixed height and it works like a champ now.  This post is how I found my problem:

http://www.telerik.com/community/forums/wpf/gridview/number-of-rows.aspx#960379