DataTemplate in WPF: How to achive TextWrapping?

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DataTemplate

Hey XML gurus out there.
I have a little problem designing my Window.
I have a ListBox and it's items should get the following template:
[Picture][Name][Description][LikeCount]

The Picture is 56 pixels width, the name 120 and the LikeCount 60 pixels. The Description should be auto-resizing when I resize the window. And this is the problem! It doesn't wrap, it uses as much space as it needs. How can I force it to wrap? My window has a MinWidth of 300, so the description will be always visable...

<Window x:Class="NeonMika.EightTracksPlayer.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:track="clr-namespace:NeonMika.EightTracks;assembly=NeonMika.EightTracks"
        xmlns:local="clr-namespace:NeonMika.EightTracksPlayer"
        Title="MainWindow" Height="350" Width="525" MinWidth="300" Loaded="Window_Loaded">
    <Window.Resources>
        <Style x:Key="StretchedContainerStyle" TargetType="{x:Type ListBoxItem}">
            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
        </Style>
    </Window.Resources>

    <Grid>
        <ScrollViewer>
            <StackPanel>
                <ListBox Name="MixControl" HorizontalAlignment="Stretch" ItemContainerStyle="{StaticResource StretchedContainerStyle}">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <Border CornerRadius="7" BorderThickness="2" BorderBrush="Black" HorizontalAlignment="Stretch">
                                <Grid HorizontalAlignment="Stretch">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="Auto"></ColumnDefinition>
                                        <ColumnDefinition Width="Auto"></ColumnDefinition>
                                        <ColumnDefinition Width="*"></ColumnDefinition>
                                        <ColumnDefinition Width="Auto"></ColumnDefinition>
                                    </Grid.ColumnDefinitions>
                                    <Border Margin="3" CornerRadius="5" BorderThickness="2" BorderBrush="Black" Width="56" Height="56" Grid.Column="0" VerticalAlignment="Center">
                                        <Border.Background>
                                            <ImageBrush ImageSource="{Binding BiggestSqCover}"/>
                                        </Border.Background>
                                    </Border>
                                    <TextBlock Grid.Column="1" Margin="3" TextWrapping="Wrap" Width="120" Text="{Binding Name}" VerticalAlignment="Center"/>
                                    <DockPanel Grid.Column="3" Margin="3" VerticalAlignment="Center" Width="60" >
                                        <TextBlock TextWrapping="NoWrap" DockPanel.Dock="Top" Text="Liked " VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                        <TextBlock TextWrapping="NoWrap" DockPanel.Dock="Top" Text="{Binding LikesCount}" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                        <TextBlock TextWrapping="NoWrap" DockPanel.Dock="Top" Text=" times" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                    </DockPanel>
                                    <TextBlock Text="{Binding Description}" VerticalAlignment="Center" Grid.Column="2" TextWrapping="Wrap" Margin="3"></TextBlock>
                                </Grid>
                            </Border>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </StackPanel>
        </ScrollViewer>
    </Grid>
</Window>