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XamNumericEditor Optional Fields and Select
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I am trying to use XamNumericEditor to achieve the following:

I want to limit input to be a nullable decimal number - when I blank the field, the decimal? bound to the control is set to null.

I want the control to be an optional field - right now, the control shows a red boarder when it has not been filled in, indicating to the user this is a required field.

Here is the XAML I currently have, but does not work based on the features above (note Config.MaxErrorPercent is a decimal? type):

                <igEditors:XamNumericEditor Text="{Binding Config.MaxErrorPercent, Mode=TwoWay}" Mask="nnn.nnnnnnnnnnnnnnnnnn" Format="###.##################" HorizontalContentAlignment="Right" HorizontalAlignment="Center" VerticalAlignment="Center" Width="50" Margin="5">
                    <igEditors:XamNumericEditor.ValueConstraint>
                        <igEditors:ValueConstraint MinInclusive="0" MaxInclusive="100" Nullable="True" ValidateAsType="Decimal"/>
                    </igEditors:XamNumericEditor.ValueConstraint>
                </igEditors:XamNumericEditor>

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