<Style x:Key="ListBoxItemStyle" TargetType="{x:Type ListBoxItem}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type ListBoxItem}">
        <Border >
          <Grid>
            <Grid.ColumnDefinitions>
              <ColumnDefinition Width="Auto"/>
              <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <ContentPresenter />
            <TextBlock Grid.Column="1" x:Name="Content" 
                       TextWrapping="WrapWithOverflow" Text="{TemplateBinding Content}"/>
          </Grid>
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>