Hi,

I don’t see any ValueConstraints in your definition.  I believe that is what is missing for you.

I created an unbound column with the following xaml:

<igDP:UnboundField  Name="Depot" Label="YColumn_REVERT" Visibility="Visible">

    <igDP:Field.Settings>

        <igDP:FieldSettings CellMinWidth="75" CellMaxWidth="75" CellWidth="75" EditAsType="{x:Type sys:String}">

        <igDP:FieldSettings.EditorStyle>

                   <Style TargetType="{x:Type igEditors:XamMaskedEditor}">

                       <Style.Triggers>

                            <DataTrigger Binding="{Binding Path=Depot}" Value="True">

                                <Setter Property="Mask" Value="####" />

                            </DataTrigger>

                            <DataTrigger Binding="{Binding Path=Depot}" Value="False">

                                <Setter Property="Mask" Value="###" />

                            </DataTrigger>

                        </Style.Triggers>

                        <Setter Property="HorizontalContentAlignment" Value="Right" />

                        <Setter Property="InvalidValueBehavior" Value="RetainValue" />

                            <Setter Property="ValueConstraint">

                                <Setter.Value>

                                    <igEditors:ValueConstraint>

                                        <igEditors:ValueConstraint.Enumeration>

                                            <x:Array Type="{x:Type sys:Object}">

                                                <sys:String>True</sys:String>

                                                <sys:String>False</sys:String>

                                            </x:Array>

                                        </igEditors:ValueConstraint.Enumeration>

                                     </igEditors:ValueConstraint>

                                </Setter.Value>

                             </Setter>

                     </Style>

               </igDP:FieldSettings.EditorStyle>

          </igDP:FieldSettings>

     </igDP:Field.Settings>

</igDP:UnboundField>

And loaded the row values in the initializeRecord event.

When the cells were being edited, the value as modified was “retained” and you are unable to leave the cell.   A message box is displayed and the EditModeValidationError is triggered.  I believe that is the appropriate behavior.   

Let me know what version of our NetAdvantage for WPF you are using and I can test further.  Or if you are expecting different behavior, please let me know.