Hello

In my project I have a XamGrid:

<Grids:XamGrid x:Name="xamGrid"

                       ItemsSource="{Binding Collection,Mode=OneWay}"    ColumnWidth="Auto" >

            <Grids:XamGrid.SelectionSettings>

                <Grids:SelectionSettings RowSelection="Multiple" CellClickAction="SelectRow" />

            </Grids:XamGrid.SelectionSettings>

            <Grids:XamGrid.GroupBySettings>

                <Grids:GroupBySettings AllowGroupByArea="Top" />

            </Grids:XamGrid.GroupBySettings>

            <Grids:XamGrid.Columns>

                <Grids:TextColumn Key="Name">

                </Grids:TextColumn>

            </Grids:XamGrid.Columns>

        </Grids:XamGrid>

I do the following:

1.     I group XamGrid by any column,

2.     Open some grouping and select any ordinary row in this grouping, 

3.     Remove grouping from XamGrid,

4.     Then I try to select another row in XamGrid. If row that was selected in grouping (i.e. previous selected row) is visible (i.e. I shouldn't scroll grid to see it) all is ok, but otherwise (when row is not visible) I get following exception:

Message: Unhandled Error in Silverlight 4 Application Object reference not set to an instance of an object.   at Infragistics.Controls.Grids.Row.SetSelected(Boolean isSelected)

   at Infragistics.Controls.Grids.Row.Infragistics.ISelectableObject.SetSelected(Boolean isSelected)

   at Infragistics.Controls.Grids.SelectedCollectionBase`1.InternalResetItemsSilently()

   at Infragistics.Controls.Grids.XamGrid.SelectRow(Row row, InvokeAction action)

   at Infragistics.Controls.Grids.XamGrid.SelectCell(Cell cell, InvokeAction action)

   at Infragistics.Controls.Grids.Cell.OnCellMouseDown(MouseEventArgs e)

   at Infragistics.Controls.Grids.XamGrid.XamWebGrid_MouseLeftButtonDown(Object sender, MouseButtonEventArgs e)

   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)

   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

How can this problem be resolved?

Alexey Lukyanov