WPF User Control with FlowDocument problem, where text won't wrap

InstrumentView.xaml

<UserControl x:Class="Its9202Gui.View.InstrumentView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit.Extended"
             mc:Ignorable="d"
             d:DesignHeight="465"
             d:DesignWidth="986" xmlns:my="clr-namespace:Its9202Gui.View">

    <UserControl.Resources>
        <Style x:Key="myButtonStyle">
            <Setter Property="Control.VerticalAlignment"
			        Value="Center" />
            <Setter Property="Control.Margin"
			        Value="12,0,0,0" />
            <Setter Property="Control.Width"
			        Value="75" />
        </Style>

        <Style x:Key="myFlowDoc">
            <Setter Property="Control.Padding"
			        Value="0" />
            <Setter Property="FlowDocumentScrollViewer.IsToolBarVisible"
			        Value="True" />
            <Setter Property="Control.MinHeight"
			        Value="150" />
            <Setter Property="Control.BorderBrush"
			        Value="SteelBlue" />
            <Setter Property="Control.BorderThickness"
			        Value="2" />
            <Setter Property="Control.VerticalAlignment"
			        Value="Stretch" />
        </Style>



    </UserControl.Resources>


    <Grid Margin="6"
	      VerticalAlignment="Stretch"
	      HorizontalAlignment="Stretch">
        <Grid.RowDefinitions>
            <RowDefinition Height="60" />
            <RowDefinition Height="67" />
            <RowDefinition Height="152" />
            <RowDefinition Height="25" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <GroupBox Header="Direct Commands">
            <StackPanel Orientation="Horizontal">

                <ComboBox ItemsSource="{Binding ScpiCommands, Mode=OneTime}"
				          Text="{Binding ScpiCommandString}"
				          HorizontalAlignment="Stretch"
				          Margin="12,0,0,0"
				          VerticalAlignment="Center"
				          MinWidth="175"
				          IsEditable="True" />
                <my:TcpSettingsView Height="0" Width="0" />
                <Button Command="{Binding SendTcpCommand}"
				        Style="{StaticResource myButtonStyle}">
                    Send
                </Button>
                <my:TcpSettingsView Height="0" x:Name="tcpSettingsView1" Width="1" />
                <Button Command="{Binding ReceiveDataCommand}"
				        Style="{StaticResource myButtonStyle}">
                    Receive
                </Button>
            </StackPanel>
        </GroupBox>


        <GroupBox Header="Debug"
		          Grid.Column="1">
            <StackPanel Orientation="Horizontal">
                <my:TcpSettingsView Height="0" x:Name="tcpSettingsView2" Width="0" />
                <ComboBox ItemsSource="{Binding DebugLevels, Mode=OneTime}"
                                        Text="{Binding DebugLevelString}"
                          HorizontalAlignment="Stretch"
				          Margin="12,0,0,0"
				          VerticalAlignment="Center"
				          MinWidth="175"
				          IsEditable="False"
                          SelectedIndex="0"/>
                <my:TcpSettingsView Height="1" x:Name="tcpSettingsView3" Width="0" />
                <Button Command ="{Binding SetDebugLevelCommand}"
                        Content="Set"
				        Style="{StaticResource myButtonStyle}" />
            </StackPanel>
        </GroupBox>


        <GroupBox Grid.Row="1"
		          Header="Settings"
		          HorizontalAlignment="Left"
		          VerticalAlignment="Top"
		          Grid.RowSpan="2"
                  IsEnabled="{Binding SettingsGroupBoxIsEnabled}">
            <Grid Height="189"
			      Width="285">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="50" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>


                <StackPanel Orientation="Vertical"
				            VerticalAlignment="Top"
				            Margin="6,6,6,0" >
                    <TextBlock HorizontalAlignment="Left">Phase</TextBlock>
                    <Controls:IntegerUpDown Value="{Binding Phase}"
					                        Height="23"
					                        Width="100"
					                        HorizontalAlignment="Left"
					                        Maximum="65535">
                    </Controls:IntegerUpDown>
                </StackPanel>

                <StackPanel Grid.Row="1" Orientation="Vertical" Margin="6,0" >
                    <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,6">Frequency Switch</TextBlock>
                    <Button 
                        Command="{Binding SwitchFreqCommand}"
				        Height="64"
				        Width="128"
				        HorizontalAlignment="Left"
				        VerticalAlignment="Top"
				        BorderThickness="0"
				        Background="Transparent">
                        <Image Source="{Binding Path=SwitchSourceImagePath}"  />
                    </Button>
                </StackPanel>
                <!-- Lock Detect-->
                <StackPanel Grid.Row="1" Grid.Column="1"  Orientation="Vertical" Margin="6,0" >
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Top" Margin="0,6">Lock Detect</TextBlock>

                    <Image 
                        Source="{Binding LockDetectImage}"
				        Height="32"
				        Width="32"
				        HorizontalAlignment="Center"
				        VerticalAlignment="Top"   />

                </StackPanel>
            </Grid>
        </GroupBox>

        <!-- Error Message And Clear Button-->
        <TextBlock Grid.Row="3"
		           FontWeight="Bold">
			Instrument Error Messages
        </TextBlock>
        <Button Grid.Row="3"
		        Command="{Binding ClearErrorsCommand}"
		        VerticalAlignment="Center"
		        Height="23"
		        Margin="0,2,16,0"
		        Style="{StaticResource myButtonStyle}"
		        HorizontalAlignment="Right">
            <StackPanel Orientation="Horizontal"
			            HorizontalAlignment="Stretch"
			            Width="70"
			            IsHitTestVisible="False">

                <Image Source="../Artwork/RedExit.png"
				       Height="16"
				       HorizontalAlignment="Left"
				       IsHitTestVisible="False" />
                <TextBlock Margin="6,0,0,0"
				           Text="Clear" />
            </StackPanel>
        </Button>

        <!-- Error Message Viewer -->
        <FlowDocumentScrollViewer Style="{StaticResource myFlowDoc}"
		                          Grid.Row="4" HorizontalScrollBarVisibility="Visible" Margin="0,0,6,-1">
            <FlowDocument IsColumnWidthFlexible="True">
                <Paragraph TextAlignment="Left"
				           TextIndent="-16"
				           LineHeight="12">
                    <ItemsControl ItemsSource="{Binding UnderlyingInstrument.ErrorMessages, Mode=OneWay}" />
                    <Run Text="{Binding /, Mode=OneWay}" />
                </Paragraph>
            </FlowDocument>
        </FlowDocumentScrollViewer>

        <!-- Information Message Text and Buttons-->
        <TextBlock FontWeight="Bold"
		           Grid.Column="1"
		           Grid.Row="3">
			Command Result Messages
        </TextBlock>
        <Button Grid.Row="3"
		        Grid.Column="1"
		        Command="{Binding GetErrorsCommand}"
		        Height="23"
		        Width="90"
		        Margin="0,2,106,0"
		        Style="{StaticResource myButtonStyle}"
		        HorizontalAlignment="Right">
            <StackPanel Orientation="Horizontal"
			            HorizontalAlignment="Stretch"
			            IsHitTestVisible="False"
			            Width="90">
                <Image Source="../Artwork/Download16.png"
				       Height="16"
				       HorizontalAlignment="Left"
				       IsHitTestVisible="False" />
                <TextBlock Margin="6,0,0,0"
				           Text="Cmd. Errors" />
            </StackPanel>
        </Button>
        <Button Grid.Column="1"
		        Command="{Binding ClearInfoCommand}"
		        Grid.Row="3"
		        Height="23"
		        HorizontalAlignment="Right"
		        Margin="0,2,16,0"
		        Style="{StaticResource myButtonStyle}">
            <StackPanel Orientation="Horizontal"
			            HorizontalAlignment="Stretch"
			            Width="73"
			            IsHitTestVisible="False">
                <Image Source="../Artwork/RedExit.png"
				       Height="16"
				       HorizontalAlignment="Left"
				       IsHitTestVisible="False" />
                <TextBlock Margin="6,0,0,0"
				           Text="Clear" />
            </StackPanel>
        </Button>


        <FlowDocumentScrollViewer Style="{StaticResource myFlowDoc}"
		                          Grid.Row="4"
		                          Grid.Column="1" 
                                  HorizontalAlignment="Left">
            <FlowDocument >
                <Paragraph  LineHeight="12" >
                    <ItemsControl ItemsSource="{Binding ReceivedData, Mode=OneWay}" />
                    <TextBlock TextWrapping="Wrap" Text="{Binding /, Mode=OneWay}" />
                </Paragraph>
            </FlowDocument>
        </FlowDocumentScrollViewer>
        <!--<Run Text="{Binding /, Mode=OneWay}" />-->
    </Grid>


</UserControl>