Slow performance on Custom GridViewDataColumn

[Paulo]

Hello guys I'm experiencing slow load performance with this simple code:

using System.Linq;
using System.Windows;
using System.Windows.Data;
using System.Collections.ObjectModel;
using Telerik.Windows.Controls;
using Telerik.Windows.Controls.GridView;

namespace SilverlightApplication1
{
    public partial class MainPage
    {
        public MainPage()
        {
            InitializeComponent();
            gv.AutoGenerateColumns = false;
            gv.EnableRowVirtualization = true;
            gv.Columns.Add(new GridViewDataColumn2("ID"));
            gv.Columns.Add(new GridViewDataColumn2("Name"));
            DataContext = new ObservableCollection<MyObject>(from i in Enumerable.Range(0, 1000) select new MyObject { Id = i, Name = string.Format("Name{0}", i) });
        }
    }

    public class GridViewDataColumn2 : GridViewDataColumn
    {
        private readonly string _propertyName;

        public GridViewDataColumn2(string propertyName)
        {
            _propertyName = propertyName;
        }

        public override FrameworkElement CreateCellElement(GridViewCell cell, object dataItem)
        {
            var auc = new RadMaskedTextInput();
            auc.SetBinding(RadMaskedTextInput.ValueProperty, new Binding(_propertyName));

            return auc;
        }
    }

    public class MyObject
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}
Xaml:
<UserControl x:Class="SilverlightApplication1.MainPage"
    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"
    xmlns:Controls="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

  <ScrollViewer x:Name="LayoutRoot" Background="White">
    <Controls:RadGridView x:Name="gv" ItemsSource="{Binding}" />
  </ScrollViewer>
</UserControl>


The problem is on Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureChild(class System.Windows.UIElement,valuetype System.Windows.Size,int32)  Telerik.Windows.Controls.GridView.dll
because it is causing an unwanted MeasureOverride.

[Vlad]

Hello,

 I strongly suggest you to read our documentation!

Measuring UI virtual items controls like RadGridView, DataGrid, ListBox, etc. with infinity will turn off the virtualization and the component will try to create all UI containers at once. 

Greetings,
Vlad
the Telerik team

[Peter]

Where is that in your documentation?

Is it better than this documentation:  

GridViewDataControl.ExpandAllHierarchyItems Method

Expands all hierarchy items.

[Vlad]

Hi,

 Here is it:
http://www.telerik.com/help/silverlight/gridview-troubleshooting-performance.html

Greetings,
Vlad
the Telerik team

[Peter]

Actually, telerik was causing a bug in .net's UIAutomation code to surface..  

for more info:
http://social.msdn.microsoft.com/Forums/en/windowsaccessibilityandautomation/thread/6c4465e2-207c-4277-a67f-e0f55eff0110