Hi

I've a MVVM application with very simple grid defined as follow (below the grid configuration):

            <igDP:XamDataGrid.FieldLayoutSettings>
                <igDP:FieldLayoutSettings AutoGenerateFields="False"
                                          AutoFitMode="OnlyWithVisibleStarFields"
                                          AllowAddNew="False"
                                          AllowDelete="False"
                                          FilterUIType="LabelIcons" 
                                          RecordSelectorLocation="None"
                                          SelectionTypeRecord="Single"
                                          SelectionTypeCell="Single"
                                          SelectionTypeField="Single" />
            </igDP:XamDataGrid.FieldLayoutSettings>

            <igDP:XamDataGrid.FieldLayouts>
                <igDP:FieldLayout>
                    <igDP:FieldLayout.Fields>
                        <igDP:Field Name="Name" Label="Name" Width="0.5*"></igDP:Field>
                        <igDP:UnboundField Name="TokenPrefix" Label="Token prefix" BindingPath="TokenPrefix" BindingMode="OneWay" Width="0.5*"></igDP:UnboundField>
                    </igDP:FieldLayout.Fields>
                </igDP:FieldLayout>
            </igDP:XamDataGrid.FieldLayouts>
        </igDP:XamDataGrid>

It works great. Now, I wanted to initially sort the items based on Name field. I've updated following markup:

 <igDP:XamDataGrid.FieldLayouts>
                <igDP:FieldLayout>
                    <igDP:FieldLayout.Fields>
                        <igDP:Field Name="Name" Label="Name" Width="0.5*"></igDP:Field>
                        <igDP:UnboundField Name="TokenPrefix" Label="Token prefix" BindingPath="TokenPrefix" BindingMode="OneWay" Width="0.5*"></igDP:UnboundField>
                    </igDP:FieldLayout.Fields>
                    <igDP:FieldLayout.SortedFields>
                        <igDP:FieldSortDescription Direction="Descending" FieldName="Name" />
                    </igDP:FieldLayout.SortedFields>
                </igDP:FieldLayout>
            </igDP:XamDataGrid.FieldLayouts>

And now, when Grid is showing there is a "Object reference not set to an instance of an object.".

I've no idea what I'm doing wrong. Here is the stack trace:

Infragistics.Windows.DataPresenter.Internal.TemplateDataRecordCache.InitializeCachedCellArea()
   at Infragistics.Windows.DataPresenter.Internal.TemplateDataRecordCache.VerifyCache()
   at Infragistics.Windows.DataPresenter.Internal.TemplateDataRecordCache.GetCellValuePresenter(Field field, Boolean createIfNull)
   at Infragistics.Windows.DataPresenter.CellTextConverterInfo..ctor(Field field)
   at Infragistics.Windows.DataPresenter.CellTextConverterInfo.GetCachedConverter(Field field)
   at Infragistics.Windows.DataPresenter.RecordManager.SameFieldRecordsSortComparer.FieldSortInfo.Initialize(FieldSortDescription fieldSortDescription, SameFieldRecordsSortComparer comparerInfo, FieldLayout fieldLayout)
   at Infragistics.Windows.DataPresenter.RecordManager.SameFieldRecordsSortComparer.FieldSortInfo..ctor(FieldSortDescription fieldSortDescription, SameFieldRecordsSortComparer comparerInfo, FieldLayout fieldLayout)
   at Infragistics.Windows.DataPresenter.RecordManager.SameFieldRecordsSortComparer..ctor(FieldLayout fieldLayout, Int32 recordsBeingSortedCount, Boolean areRecordsInUnsortedOrder)
   at Infragistics.Windows.DataPresenter.RecordManager.SortHelper(Record[] records, Boolean hasGroupByFields, Boolean& hasMultipleFieldLayouts, Boolean areRecordsInUnsortedOrder)
   at Infragistics.Windows.DataPresenter.RecordManager.VerifySort()
   at Infragistics.Windows.DataPresenter.RecordManager.OnSourceCollectionReset()
   at Infragistics.Windows.DataPresenter.RecordManager.PostDelayedReset()
   at Infragistics.Windows.DataPresenter.RecordManager.SetDataSource(IEnumerable currentValue, Boolean postReset)
   at Infragistics.Windows.DataPresenter.RecordManager.set_DataSource(IEnumerable value)
   at Infragistics.Windows.DataPresenter.DataPresenterBase.VerifyRecordManagerDataSource()
   at Infragistics.Windows.DataPresenter.DataPresenterBase.InitializeRecordManagerDataSource()
   at Infragistics.Windows.DataPresenter.DataPresenterBase.get_CurrentRecordListControl()
   at Infragistics.Windows.DataPresenter.DataPresenterBase.VerifyContentSiteGrid()
   at Infragistics.Windows.DataPresenter.DataPresenterBase.OnApplyTemplate()
   at System.Windows.FrameworkElement.ApplyTemplate()
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
   at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Border.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Control.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at FT.Desktop.UI.App.Main() in C:\depot\ws\depot\Forecasting Tools\Sources\FT.Desktop\obj\x86\Debug\UI\App.g.cs:line 0
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)