MidiBoard/MidiTest/MainWindow.xaml

<Window x:Class="MidiTest.MainWindow"
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        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:MidiTest"
        mc:Ignorable="d"
        Title="MainWindow" Height="443" Width="497">
  <Grid>
    <Label Content="Midi-Device" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top"/>
    <ComboBox x:Name="MidiSelector" HorizontalAlignment="Left" Margin="89,12,0,0" VerticalAlignment="Top" Width="300"/>
    <Grid Margin="10,50,10,10">
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    </Grid>
  </Grid>
</Window>