After several test I got it!!!! Post the solution so other can use it:
<Window x:Class="InterfazOhmio.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" Background="Gray">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200"></ColumnDefinition>
</Grid.ColumnDefinitions>
<ListBox ScrollViewer.VerticalScrollBarVisibility="Auto">
<ListBox.Resources>
<Style TargetType="{x:Type Expander}">
<Setter Property="IsExpanded"
Value="{Binding Path=IsSelected, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"/>
</Style>
</ListBox.Resources>
<ListBox.Template>
<ControlTemplate TargetType="{x:Type ListBox}">
<ItemsPresenter/>
</ControlTemplate>
</ListBox.Template>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<ContentPresenter Content="{TemplateBinding Content}"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
<Expander Background="OliveDrab">
<Expander.Header>
<BulletDecorator>
<BulletDecorator.Bullet>
<Image Source="Iconos/Pedidos.png" Width="64" Height="64" HorizontalAlignment="Left" VerticalAlignment="Top" />
</BulletDecorator.Bullet>
<TextBlock Margin="10,0,0,0" Text="Pedidos" VerticalAlignment="Center" HorizontalAlignment="Stretch" Foreground="White" />
</BulletDecorator>
</Expander.Header>
<WrapPanel>
<Label Margin="20,5,5,5" Foreground="white" Content="Nuevo Pedido"/>
<Label Margin="20,5,5,5" Foreground="white" Content="Consultar Pedidos"/>
<Label Margin="20,5,5,5" Foreground="white" Content="Pedidos Pendientes"/>
</WrapPanel>
</Expander>
<Expander Background="OrangeRed">
<Expander.Header>
<BulletDecorator>
<BulletDecorator.Bullet>
<Image Source="Iconos/Remitos.png" Width="64" Height="64" HorizontalAlignment="Left" VerticalAlignment="Top" />
</BulletDecorator.Bullet>
<TextBlock Margin="10,0,0,0" Text="Remitos" VerticalAlignment="Center" HorizontalAlignment="Stretch" Foreground="White" />
</BulletDecorator>
</Expander.Header>
<WrapPanel>
<Label Margin="20,5,5,5" Foreground="white" Content="Nuevo Remito"/>
<Label Margin="20,5,5,5" Foreground="white" Content="Consultar Remitos"/>
<Label Margin="20,5,5,5" Foreground="white" Content="Remitos Pendientes de Facturar"/>
</WrapPanel>
</Expander>
<Expander Background="Teal">
<Expander.Header>
<BulletDecorator>
<BulletDecorator.Bullet>
<Image Source="Iconos/Facturas.png" Width="64" Height="64" HorizontalAlignment="Left" VerticalAlignment="Top" />
</BulletDecorator.Bullet>
<TextBlock Margin="10,0,0,0" Text="Facturas" VerticalAlignment="Center" HorizontalAlignment="Stretch" Foreground="White" />
</BulletDecorator>
</Expander.Header>
<WrapPanel>
<Label Margin="20,5,5,5" Foreground="white" Content="Nueva Factura"/>
<Label Margin="20,5,5,5" Foreground="white" Content="Consultar Facturas Normales y Anuladas"/>
</WrapPanel>
</Expander>
</ListBox>
</Grid>
</Window>
And this is the result
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…