ScrollViewer y ListBox Width "Auto"

<ScrollViewer Margin="0,3,1,0" Grid.Row="1" Grid.RowSpan="3">
<ListBox x:Name="ListBoxTransactionEarn" HorizontalAlignment="Left" Height="130" VerticalAlignment="Top" Width="Auto" SelectionChanged="ListBoxTransaction_SelectionChanged" BorderBrush="#FF2070FB" ScrollViewer.HorizontalScrollBarVisibility="Auto" >
   <ListBox.ItemTemplate>
      <DataTemplate>
        <StackPanel x:Name="StackPanelListBox" Orientation="Horizontal"                     Width="Auto" Height="Auto">
                    <TextBlock x:Name="date" Text="{Binding date}" Width="1" Foreground="#FF007021"/>
                    <TextBlock x:Name="nombre" Text="{Binding nombre}" Width="170"/>
                    <TextBlock x:Name="amount" Text="{Binding amount}" Width="110"/>
                    <TextBlock x:Name="descripcion" Text="{Binding tipo}" Width="200"/>
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </ScrollViewer>