MainPage.xaml

<Page
    x:Class="Microsoft.Azure.Devices.Client.Samples.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Microsoft.Azure.Devices.Client.Samples"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" >

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Margin="10">

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="360" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="48" />
            <RowDefinition Height="48" />
            <RowDefinition Height="196" />
            <RowDefinition Height="196" />
            <RowDefinition Height="196" />
        </Grid.RowDefinitions>

        <TextBlock                          Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" TextWrapping="Wrap" Text="Protocol:" VerticalAlignment="Top"/>
        <ComboBox x:Name="protocolComboBox" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" Width="220" SelectionChanged="OnProtocolSelectionChanged" />

        <Button x:Name="sendButton"         Grid.Row="1" Grid.Column="0" Width="240" Content="Send message:" HorizontalAlignment="Left" VerticalAlignment="Top" Click="sendButton_Click"/>
        <TextBox x:Name="messageText"       Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left" TextWrapping="Wrap" Text="" Width="220" VerticalAlignment="Top"/>

        <Button x:Name="receiveButton"      Grid.Row="2" Grid.Column="0" Width="240" Content="Receive message" HorizontalAlignment="Left" VerticalAlignment="Top" Click="receiveButton_Click" />
        <ListBox x:Name="messageList"       Grid.Row="2" Grid.Column="1" HorizontalAlignment="Left" Height="Auto" Margin="0" VerticalAlignment="Top" BorderThickness="0"/>

        <TextBlock                          Grid.Row="3" Grid.Column="0" HorizontalAlignment="Left" TextWrapping="Wrap" Text="Method `immediateReboot` log" VerticalAlignment="Top"/>
        <ListBox x:Name="methodCallList"    Grid.Row="3" Grid.Column="1" HorizontalAlignment="Left" Height="Auto" Margin="0" VerticalAlignment="Top" BorderThickness="0"/>

        <TextBlock                          Grid.Row="4" Grid.Column="0" HorizontalAlignment="Left" TextWrapping="Wrap" Text="Method `GetDeviceName` log" VerticalAlignment="Top"/>
        <ListBox x:Name="getDeviceNameList" Grid.Row="4" Grid.Column="1" HorizontalAlignment="Left" Height="Auto" Margin="0" VerticalAlignment="Top" BorderThickness="0"/>

    </Grid>
</Page>