MPF/MainWindow.xaml

<Window x:Class="DICUI.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:DICUI"
        mc:Ignorable="d"
        Title="Disc Image Creator GUI" Height="400" Width="600">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="4*"/>
            <ColumnDefinition Width="13*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="4*"/>
            <RowDefinition Height="1*"/>
            <RowDefinition Height="1*"/>
        </Grid.RowDefinitions>

        <GroupBox Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Margin="5,5,5.2,5.4" HorizontalAlignment="Stretch" Header="Settings"/>
        <GroupBox Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Margin="5,4.6,5.2,4.8" HorizontalAlignment="Stretch" Header="Controls"/>
        <GroupBox Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2" Margin="5,5.2,5.2,4.8" HorizontalAlignment="Stretch" Header="Status"/>

        <Grid Grid.Row="0" Grid.Column="0" Margin="15,25,15.2,10.4" Grid.ColumnSpan="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
                <ColumnDefinition Width="2.5*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>

            <Label Grid.Row="0" Grid.Column="0" VerticalAlignment="Center">Disc Type</Label>
            <ComboBox x:Name="cmb_DiscType" Grid.Row="0" Grid.Column="1" Height="22" SelectionChanged="cmb_DiscType_SelectionChanged" />

            <Label Grid.Row="1" Grid.Column="0" VerticalAlignment="Center">Output Filename</Label>
            <TextBox x:Name="txt_OutputFilename" Grid.Row="1" Grid.Column="1" Height="22"></TextBox>

            <Label Grid.Row="2" Grid.Column="0" VerticalAlignment="Center">Output Directory</Label>
            <TextBox x:Name="txt_OutputDirectory" Grid.Row="2" Grid.Column="1" Height="22" Width="345" HorizontalAlignment="left" Text="ISO" />
            <Button x:Name="btn_OutputDirectoryBrowse" Grid.Row="2" Grid.Column="1" Height="22" Width="50" HorizontalAlignment="Right" Content="Browse" Click="btn_OutputDirectoryBrowse_Click"/>

            <Label Grid.Row="3" Grid.Column="0" VerticalAlignment="Center">Drive Letter</Label>
            <ComboBox x:Name="cmb_DriveLetter" Grid.Row="3" Grid.Column="1" Height="22" Width="397" HorizontalAlignment="left" SelectionChanged="cmb_DriveLetter_SelectionChanged"/>

            <Label Grid.Row="4" Grid.Column="0" VerticalAlignment="Center">Drive Speed</Label>
            <ComboBox x:Name="cmb_DriveSpeed" Grid.Row="4" Grid.Column="1" Height="22" Width="60" HorizontalAlignment="left" SelectionChanged="cmb_DriveSpeed_SelectionChanged"/>

            <Label Grid.Row="5" Grid.Column="0" VerticalAlignment="Center">Custom Parameters</Label>
            <TextBox x:Name="txt_CustomParameters" Grid.Row="5" Grid.Column="1" Height="22" Width="397" HorizontalAlignment="left" IsEnabled="False" />
        </Grid>

        <Grid Grid.Row="1" Grid.Column="0" Margin="15,19.6,15.2,9.8" Grid.ColumnSpan="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
                <ColumnDefinition Width="1*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition/>
            </Grid.RowDefinitions>

            <Button x:Name="btn_Start" Grid.Row="0" Grid.Column="0" Height="22" Width="150" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Start Dumping" Click="btn_Start_Click" IsEnabled="False" />
            <Button x:Name="btn_Search" Grid.Row="0" Grid.Column="1" Height="22" Width="150" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Scan for disks" Click="btn_Search_Click" />
        </Grid>

        <Grid Grid.Row="2" Grid.Column="0" Margin="15,20.2,15.2,9.8" Grid.ColumnSpan="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition/>
            </Grid.RowDefinitions>

            <Label x:Name="lbl_Status" Grid.Row="0" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Waiting for CD or DVD..." />
        </Grid>
    </Grid>
</Window>