In the column below, the ValueChanged event is handled by tValueChanged. 

When XamTextEditor.Value is set, the cursor is positioned at the beginning of the text in the textbox.  This has the effect of causing the user to type in their text backwards.  So if i type "abc" I get "cba".  How do I fix this please?  I have already tried a value converter however the textbox is only updated after the user exit the field.  I want the value to be updated as the user types.

BTW the developer who originally wrote the code below claims it was working with version 11.2 and that it broke when the app was moved to 12.2.

<igDP:Field Name="BROKER" Label="Broker">
                    <igDP:Field.Settings>
                        <igDP:FieldSettings AllowEdit="True"
                                            CellClickAction="EnterEditModeIfAllowed"
                                            CellValuePresenterStyle="{StaticResource BrokerCell}">
                            <igDP:FieldSettings.EditorStyle>
                                <Style TargetType="{x:Type igEditors:XamTextEditor}"
                                       BasedOn="{StaticResource BaseTextEditorStyle}">
                                    <Setter Property="ValueConstraint">
                                        <Setter.Value>
                                            <igEditors:ValueConstraint MaxLength="3"/>
                                        </Setter.Value>
                                    </Setter>
                                    <EventSetter Event="ValueChanged" Handler="tValueChanged"/>
                                </Style>
                            </igDP:FieldSettings.EditorStyle>
                        </igDP:FieldSettings>
                    </igDP:Field.Settings>
                </igDP:Field>

private void tValueChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
            var val = (string)e.NewValue;
            Dispatcher.BeginInvoke(new Action(() => ((XamTextEditor)sender).Value = val != null ? val.ToUpper() : val), DispatcherPriority.DataBind,null);
        }