MainWindow.xaml

<Window x:Class="Waher.Script.Lab.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:Waher.Script.Lab"
        mc:Ignorable="d"
        Title="Waher Script Lab" Height="400" Width="600" Loaded="Window_Loaded" Closing="Window_Closing">
    <DockPanel>
        <StackPanel DockPanel.Dock="Bottom" Margin="5,5,5,5">
            <TextBox Name="Input" TextWrapping="Wrap" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" VerticalScrollBarVisibility="Auto"
                         ToolTip="Enter script to execute here." AcceptsTab="True" Margin="0,0,0,0" Height="60"
                         AcceptsReturn="True" PreviewKeyDown="Input_PreviewKeyDown" />
        </StackPanel>
        <ScrollViewer VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Disabled" Name="HistoryScrollViewer">
            <StackPanel Name="HistoryPanel">
            </StackPanel>
        </ScrollViewer>
    </DockPanel>
</Window>