prs/testing/DataLogistics/Light Bulb/MainWindow.xaml

<Window x:Class="Receiver.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"
        xmlns:local="clr-namespace:Receiver"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext><local:MainWindowViewModel x:Name="ViewModel"/></Window.DataContext>
    <Grid>
        <TextBox Background="Black"/>
        <TextBox Background="{Binding LightHex}" Visibility="{Binding LightVisibility}"/>
    </Grid>
</Window>