Как мне настроить двухполосную многосвязку?..

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Привет,
Я создал простую multibinding такой:

<Border removed="#FF880000" BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5"> 
                        <TextBox removed="Transparent" MaxLength="3" Text="{Binding ElementName=SRed, Path=Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="WhiteSmoke" MinWidth="40" Margin="2" BorderBrush="Transparent"/>
                    </Border>
                    <Border removed="#FF008800" BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5">
                        <TextBox removed="Transparent" MaxLength="3" Text="{Binding ElementName=SGreen, Path=Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="WhiteSmoke" MinWidth="40" Margin="2" BorderBrush="Transparent"/>
                    </Border>
                    <Border removed="#FF000088" BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5">
                        <TextBox removed="Transparent" MaxLength="3" Text="{Binding ElementName=SBlue, Path=Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="WhiteSmoke" MinWidth="40" Margin="2" BorderBrush="Transparent"/>
                    </Border>
                    <Border removed="#FF666666" BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5">
                        <TextBox removed="Transparent" MaxLength="3" Text="{Binding ElementName=SA, Path=Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="WhiteSmoke" MinWidth="40" Margin="2" BorderBrush="Transparent"/>
                    </Border>
                    <Border removed="#FF00B9B9" BorderThickness="1" BorderBrush="Black" CornerRadius="5" Margin="5">
                        <TextBox removed="Transparent" Foreground="WhiteSmoke" MinWidth="40" Margin="2" BorderBrush="Transparent">
                            <TextBox.Text>
                                <MultiBinding Converter="{StaticResource RTHC}" Mode="TwoWay">
                                    <Binding ElementName="SRed" Path="Value" />
                                    <Binding ElementName="SGreen" Path="Value" />
                                    <Binding ElementName="SBlue" Path="Value" />
                                    <Binding ElementName="SA" Path="Value" />
                                </MultiBinding>
                            </TextBox.Text>
                        </TextBox>
                    </Border>

Что это взаимное MultiBinding в других текстовых полях.
Затем я создал этот класс:

public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            byte R = byte.Parse(values[0].ToString());
            byte G = byte.Parse(values[1].ToString());
            byte B = byte.Parse(values[2].ToString());
            byte A = byte.Parse(values[3].ToString());
            return DecToHex(A) + DecToHex(R) + DecToHex(G) + DecToHex(B);
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            string v = value.ToString();
            return new object[4] { HexToDec(v.Substring(0, 2)), HexToDec(v.Substring(2, 2)), HexToDec(v.Substring(4, 2)), HexToDec(v.Substring(6, 2)) };
        }

Eberything реализован правильно, но текстовые поля не обновляются, когда я изменяю значение в текстовом поле, в котором я установил многосвязку.

Вот несколько скриншотов:
http://snap.ashampoo.com/Yvu9z61n[^]
http://snap.ashampoo.com/Z6Rmvl6u[^]
http://snap.ashampoo.com/fVwFrBI8[^]

Спасибо.

---Jymmy097

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