MainWindow.xaml

<Window x:Class="EvalUITest.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:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:EvalUITest"
        mc:Ignorable="d"
        Title="Script Shell" Height="350" Width="525"
        d:DataContext="{d:DesignInstance local:MainVM, IsDesignTimeCreatable=False}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="10"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid.Resources>
            <local:BooleanToStringConverter x:Key="ResultHeaderConverter" OnTrue="Result:" OnFalse="Error:"/>
        </Grid.Resources>
        <ListView ItemsSource="{Binding AllCommands}" SelectedItem="{Binding CurrentCommand}" Grid.Row="0" Grid.ColumnSpan="3">
            <ListView.ItemTemplate>
                <DataTemplate DataType="{x:Type local:CommandVM}">
                    <Border BorderBrush="LightGreen" Name="border" BorderThickness="2,0,0,0" Padding="4,2">
                        <TextBlock Text="{Binding Text}"/>
                    </Border>
                    <DataTemplate.Triggers>
                        <DataTrigger Binding="{Binding IsSuccessful}" Value="False">
                            <Setter TargetName="border" Property="BorderBrush" Value="Red"/>
                        </DataTrigger>
                    </DataTemplate.Triggers>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
        <Label Target="{Binding ElementName=CCBox}" Content="Command:" Grid.Row="1" Grid.Column="0"/>
        <DockPanel Grid.Row="1" Grid.Column="2" IsEnabled="{Binding IsInteractive}">
            <Button Command="{Binding Evaluate}" Content="Run!" DockPanel.Dock="Right" Width="75"/>
            <TextBox Name="CCBox" VerticalContentAlignment="Center">
                <TextBox.InputBindings>
                    <KeyBinding Command="{Binding Evaluate}" Key="Return"/>
                    <KeyBinding Command="{Binding GoUp}" Key="Up"/>
                    <KeyBinding Command="{Binding GoDown}" Key="Down"/>
                </TextBox.InputBindings>
                <i:Interaction.Behaviors>
                    <local:CaretEndBehavior Text="{Binding CurrentInput, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
                </i:Interaction.Behaviors>
            </TextBox>
        </DockPanel>
        <Label Target="{Binding ElementName=ResultBox}" Content="{Binding LastCommand.IsSuccessful, Converter={StaticResource ResultHeaderConverter}}" Grid.Row="2" Grid.Column="0"/>
        <TextBox Text="{Binding LastCommand.Result, Mode=OneWay}" IsEnabled="False" VerticalContentAlignment="Center" Grid.Row="2" Grid.Column="2" Name="ResultBox"/>
        <Label Content="strut" Grid.Row="2" Grid.Column="1" Visibility="Hidden"/>
    </Grid>
</Window>