So how would I bind to the ValueConstraint?

Like this embedded code?

I found the article you mention but nothing seems to work including this.

                                                <igWPF:Field Name="Zone1Amps" Label ="Zone Current"  Width="150">
                                                    <igWPF:Field.Settings>
                                                        <igWPF:FieldSettings>
                                                            <igWPF:FieldSettings.EditorStyle>
                                                                <Style TargetType="igWPF:XamNumericEditor">
                                                                    <Setter Property="IsEnabled" Value="{Binding IsEditEnabled, ElementName=rampGrid}" />
                                                                    <Setter Property="Format" Value="0.000" />
                                                                    <Setter Property="ValueType" Value="{x:Type System:Double}" />
                                                                    <Setter Property="Mask" Value="{}{double:2.3}" />
                                                                    <Setter Property="ValueConstraint" Value="{Binding CurrentLimit, ElementName=rampGrid}" />
                                                                </Style>
                                                            </igWPF:FieldSettings.EditorStyle>
                                                        </igWPF:FieldSettings>
                                                    </igWPF:Field.Settings>
                                                </igWPF:Field>


        public static readonly DependencyProperty CurrentLimitProperty =
            DependencyProperty.Register("CurrentLimit", typeof(double), typeof(NexxCustomXamDataGrid), new PropertyMetadata(30.0, OnNumberRspParamChanged));

        public double CurrentLimit
        {
            get { return (double)GetValue(CurrentLimitProperty); }
            set { SetValue(CurrentLimitProperty, value); }
        }

        private static void OnNumberRspParamChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            NexxCustomXamDataGrid numberRspParam = e.NewValue as NexxCustomXamDataGrid;

            if (numberRspParam != null)
            {
                ValueEditor editor = d as ValueEditor;
                ValueConstraint constraint = editor.ValueConstraint;


                if (constraint == null)
                    editor.ValueConstraint = constraint = new ValueConstraint();


                constraint.SetValue(ValueConstraint.MaxInclusiveProperty, 15.0/*numberRspParam.MaxValue*/);
                constraint.SetValue(ValueConstraint.MinInclusiveProperty, 0.0/*numberRspParam.MinValue*/);
            }
        }