HorizontalContentAlignment of SelectedItem not stretching perfectly - wpf

Question

I made a custom styled list in WPF:
<DataTemplate x:Key="SelectedTemplate">
<StackPanel Background="#FF4E4E4E" HorizontalAlignment="Stretch">
<TextBlock Text="{Binding Path=Title}" Foreground="#FFD80000" />
</StackPanel>
</DataTemplate>
<Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle">
<Setter Property="ContentTemplate"
Value="{StaticResource ItemTemplate}" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="ContentTemplate"
Value="{StaticResource SelectedTemplate}" />
</Trigger>
</Style.Triggers>
</Style>
...
<ListBox
Name="lbSongs"
DockPanel.Dock="Left"
ItemsSource="{Binding Path=SongDirectory}"
SelectedItem="{Binding Path=Song, Mode=TwoWay}"
Visibility="{Binding Path=ListVisibility}"
ItemContainerStyle="{StaticResource ContainerStyle}"
HorizontalContentAlignment="Stretch"
Width="180px" Background="#FF333333" />
I tried to make a custom style for the selected item. To make the selection bar stretch to the width of the ListBox, I set the ItemContainerStyle's HorizontalContentAlignment property to "Stretch". The problem is that it does not stretch fully, a tiny bar on the left still remains and the original (blue) selection bar is still visible there. See the screenshot:
How can I make it to stretch to full size? Or how can I style the original selection bar?
Thanks in advance.

Answer 1

Just set the Padding for the ListBoxItem to zero. That blue bar should disappear.
<Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle">
<Setter Property="Padding" Value="0"/>
...
</Style>
Another option is just to re-write the ControlTemplate for the ListBoxItem so that you'll have better control on how it looks like. But yeah, this may not be necessary in your case.