WPF MultiBinding grid background with 3 sliders

//xaml
<Window x:Class="WpfApp232.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        WindowState="Maximized"
        xmlns:local="clr-namespace:WpfApp232"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <local:MultiColorConverter x:Key="multiColorConverter"/>
    </Window.Resources>
    <Grid>
        <Grid.Background> 
                <MultiBinding Converter="{StaticResource multiColorConverter}">
                    <Binding Path="RedByte" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"/>
                    <Binding Path="GreenByte" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"/>
                    <Binding Path="BlueByte" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"/>
                </MultiBinding> 
        </Grid.Background>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Slider x:Name="redSlider"
                Value="{Binding RedByte,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                Minimum="0"
                Maximum="255"
                Grid.Column="0"
                Background="Red"/>

        <Slider x:Name="greenSlider"
                Value="{Binding GreenByte,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                Minimum="1"
                Maximum="255"
                Grid.Column="1"
                Background="Green"/>

        <Slider x:Name="blueSlider"
                Value="{Binding BlueByte,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                Minimum="2"
                Maximum="255"
                Grid.Column="2"
                Background="Blue"/>
    </Grid>
</Window>



//cs
using System.ComponentModel;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp232
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
            OnValueChanged();
        }


        public event PropertyChangedEventHandler? PropertyChanged;
        public void OnPropertyChanged([CallerMemberName] string propName = "")
        {
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propName));
            }
        }

        private byte redByte;
        public byte RedByte
        {
            get { return redByte; }
            set
            {
                if (value != redByte)
                {
                    redByte = value;
                    OnPropertyChanged();
                    OnValueChanged();
                }
            }
        }

        private byte greenByte;
        public byte GreenByte
        {
            get { return greenByte; }
            set
            {
                if (value != greenByte)
                {
                    greenByte = value;
                    OnPropertyChanged();
                    OnValueChanged();
                }
            }
        }

        private byte blueByte;
        public byte BlueByte
        {
            get { return blueByte; }
            set
            {
                if (value != blueByte)
                {
                    blueByte = value;
                    OnPropertyChanged();
                    OnValueChanged();
                }
            }
        }

        private void OnValueChanged()
        {
            Application.Current?.Dispatcher.BeginInvoke(new Action(() =>
            {
                this.Title = $"Red:{redByte},Green:{greenByte},Blue:{blueByte}";
            }));
        }
    }

    public class MultiColorConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values.Length == 3 &&
                byte.TryParse(values[0]?.ToString(), out byte r) &&
                byte.TryParse(values[1]?.ToString(), out byte g) &&
                byte.TryParse(values[2]?.ToString(), out byte b))
            {
                return new SolidColorBrush(Color.FromRgb(r, g, b));
            }
            return Brushes.Gray;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}