Cupola/Tranquility/MainWindow.xaml

<Window x:Class="Tranquility.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:Tranquility"
        mc:Ignorable="d"
        Title="Tranquility" Height="450" Width="539">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid x:Name="Left" Grid.ColumnSpan="2" HorizontalAlignment="Stretch" Height="NaN" Margin="0,0,0,0" VerticalAlignment="Stretch" Width="NaN">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button x:Name="Load" Content="Load" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="35" Width="65" Click="LoadFilesClick"/>
            <TextBox x:Name="Input_Folder" Margin="80,10,10,0" TextWrapping="Wrap" Text="INPUT FOLDER" VerticalAlignment="Top" Height="35"/>
            <TextBox x:Name="Input_Files" TextWrapping="Wrap" Text="INPUT FILES" Margin="10,50,10,10"/>
        </Grid>
        <Grid x:Name="Right" Grid.ColumnSpan="2" Height="NaN" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Width="NaN">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button x:Name="Run" Content="Run" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="35" Width="64" Grid.Column="1" Click="Run"/>
            <ProgressBar x:Name="Progress" Height="35" Margin="78,10,10,0" VerticalAlignment="Top" Grid.Column="1"/>
            <Image x:Name="Preview" Grid.Column="1" Margin="12,53,12,56"/>
            <Button x:Name="Save" Content="Save" Margin="10,0,10,10" Grid.Column="1" Height="35" VerticalAlignment="Bottom"/>
        </Grid>
    </Grid>
</Window>