CodeBox 2: An Extended and Improved Version of the CodeBox with Line Numbers

<TextBox x:Class="CodeBoxControl.CodeBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:c="clr-namespace:CodeBoxControl"
    >
    <TextBox.Template>
    <ControlTemplate TargetType="c:CodeBox" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
            
        <Border BorderThickness="{TemplateBinding Border.BorderThickness}" BorderBrush="{TemplateBinding Border.BorderBrush}"
                 Background="{TemplateBinding Panel.Background}" Name="Bd" SnapsToDevicePixels="True" > 
        <Grid Background="Transparent"  >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="{Binding Path =  LineNumberMarginWidth, RelativeSource={RelativeSource Templatedparent}, Mode=OneWay}" />
                    <ColumnDefinition  Width ="*"/>  
                </Grid.ColumnDefinitions>
           <ScrollViewer Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" Grid.Column="1" />
            </Grid></Border >
            <ControlTemplate.Triggers>
            <Trigger Property="UIElement.IsEnabled">
                <Setter Property="Panel.Background" TargetName="Bd">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.GrayTextBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Setter Property="TextElement.Foreground">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.GrayTextBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Trigger.Value>
                    <s:Boolean>False</s:Boolean>
                </Trigger.Value>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
</TextBox.Template>
</TextBox>