Cannot edit grid cell Q1 2011 Value does not fall within the expected range

[Leslie]

I just installed the new Q1 2011 release for Silverlight, and I can no longer edit a grid cell.  I get an ArgumentException: Value does not fall within the expected range.

This happens if I try to edit by double clicking or by doing a BeginEdit.  The grid is bound to a collection and initially displays fine.

Here is a sample call stack:

>   System.Windows.dll!MS.Internal.XcpImports.CheckHResult(uint hr) + 0x48 bytes
    System.Windows.dll!MS.Internal.XcpImports.SetValue(MS.Internal.IManagedPeerBase obj = {Telerik.Windows.Controls.GridView.GridViewEditorPresenter}, System.Windows.DependencyProperty property, System.Windows.DependencyObject doh = {System.Windows.Controls.TextBlock}) + 0x7c bytes
    System.Windows.dll!MS.Internal.XcpImports.SetValue(MS.Internal.IManagedPeerBase doh, System.Windows.DependencyProperty property, object obj) + 0x127 bytes
    System.Windows.dll!System.Windows.DependencyObject.SetObjectValueToCore(System.Windows.DependencyProperty dp, object value) + 0xd4 bytes
    System.Windows.dll!System.Windows.DependencyObject.SetEffectiveValue(System.Windows.DependencyProperty property = {System.Windows.CoreDependencyProperty}, ref System.Windows.EffectiveValueEntry newEntry = {System.Windows.EffectiveValueEntry}, object newValue = {System.Windows.Controls.TextBlock}) + 0x35 bytes
    System.Windows.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.DependencyProperty property = {System.Windows.CoreDependencyProperty}, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, System.Windows.DependencyObject.ValueOperation operation) + 0xe9 bytes
    System.Windows.dll!System.Windows.DependencyObject.SetValueInternal(System.Windows.DependencyProperty dp, object value, bool allowReadOnlySet) + 0x2ad bytes
    System.Windows.dll!System.Windows.Controls.ContentControl.Content.set(object value) + 0x26 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.SetEditorContent() + 0xce bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.ShowEditor() + 0x26 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.ToggleEditor() + 0x34 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewDataControl.OnCellEditModeChanged(Telerik.Windows.Controls.GridView.GridViewCell cell = {Telerik.Windows.Controls.GridView.GridViewCell}, bool newIsInEditMode = true) + 0x15c bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.IsInEditModeChanged(System.Windows.DependencyObject target = {Telerik.Windows.Controls.GridView.GridViewCell}, System.Windows.DependencyPropertyChangedEventArgs e = {System.Windows.DependencyPropertyChangedEventArgs}) + 0xb3 bytes
    Telerik.Windows.Controls!Telerik.Windows.PropertyMetadata.Create.AnonymousMethod__0(System.Windows.DependencyObject d = {Telerik.Windows.Controls.GridView.GridViewCell}, System.Windows.DependencyPropertyChangedEventArgs e = {System.Windows.DependencyPropertyChangedEventArgs}) + 0x283 bytes
    System.Windows.dll!System.Windows.DependencyObject.RaisePropertyChangeNotifications(System.Windows.DependencyProperty dp = {System.Windows.CustomDependencyProperty}, object oldValue, object newValue) + 0x51 bytes
    System.Windows.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.DependencyProperty property, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, System.Windows.DependencyObject.ValueOperation operation) + 0xf6 bytes
    System.Windows.dll!System.Windows.DependencyObject.SetValueInternal(System.Windows.DependencyProperty dp, object value, bool allowReadOnlySet) + 0x2ad bytes
    System.Windows.dll!System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty dp, object value) + 0xb bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.IsInEditMode.set(bool value = true) + 0x53 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewDataControl.SwitchCellToEditMode(Telerik.Windows.Controls.GridView.GridViewCell cell = {Telerik.Windows.Controls.GridView.GridViewCell}) + 0x64 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewDataControl.BeginEdit(Telerik.Windows.Controls.GridView.GridViewCell gridViewCell = {Telerik.Windows.Controls.GridView.GridViewCell}, System.Windows.RoutedEventArgs editingEventArgs = {System.Windows.Input.MouseButtonEventArgs}) + 0x2c3 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewDataControl.OnCellMouseDown(Telerik.Windows.Controls.GridView.GridViewCell cell = {Telerik.Windows.Controls.GridView.GridViewCell}, System.Windows.Input.MouseButtonEventArgs args = {System.Windows.Input.MouseButtonEventArgs}) + 0x125 bytes
    Telerik.Windows.Controls.GridView!Telerik.Windows.Controls.GridView.GridViewCell.OnMouseLeftButtonDown(System.Windows.Input.MouseButtonEventArgs e = {System.Windows.Input.MouseButtonEventArgs}) + 0xde bytes
    System.Windows.dll!System.Windows.Controls.Control.OnMouseLeftButtonDown(System.Windows.Controls.Control ctrl, System.EventArgs e) + 0x38 bytes
    System.Windows.dll!MS.Internal.JoltHelper.FireEvent(System.IntPtr unmanagedObj, System.IntPtr unmanagedObjArgs, int argsTypeIndex, int actualArgsTypeIndex, string eventName) + 0x234 bytes
    [Appdomain Transition]

[Leslie]

Sorry, this is an issue with our code and has nothing to do with the upgrade!  It just happened to occur on the same day!

All is working fine again!