WPF bind listview selected item to expander expanded

Question

I've just started testing the water with WPF and I'm trying to bind the expanded property of an expander and the selected property of a listview item together so that when a list view item is selected the expander expands or going down another road trying to set the listview item to selected on expand of the expander

so far I've got

<ListView HorizontalAlignment="Stretch"  Name="listView1" VerticalAlignment="Stretch" SelectionMode="Single" >
        <ListView.Resources>
            <Style TargetType="{x:Type ListViewItem}">
                <Setter Property="IsSelected" Value="{Binding Path=IsExpanded, Mode=TwoWay}"/>
            </Style>
        </ListView.Resources>
        <ListView.ItemTemplate>
            <DataTemplate>
                <Expander>
                        <TextBlock Text="{Binding Name}"></TextBlock>
                </Expander>
            </DataTemplate>
        </ListView.ItemTemplate>            
    </ListView>

But I can't figure out how to reference the expander in the binding. Any help or a nudge in the right direction would be appreciated.

Thanks

Answer 1

Well..

You can not connect listboxitem with its own template ... Because basically they do not know... That would not work here:

 <Style TargetType="ListBoxItem">
             <Style.Triggers>
                    <DataTrigger Binding="{Binding ElementName=expanderHeader,Mode=OneWay}" Value="True">
                 <Setter Property="IsSelected" value="True"/>
                    </ DataTrigger>
             </ Style.Triggers>
     </ Style>

You also can not fire a trigger of the expander, because setters do not accept binding ..   

<Expander.Style>
     <Style TargetType="Expander">
         <Style.Triggers>
             <Trigger Property="IsExpanded" Value="True">
                 <Setter Property="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}, Path=IsSelected}" Value="True"/>
             </ Trigger>
          </ Style.Triggers>
     </ Style>
</ Expander.Style>

The answer is this:

    <ListBox.ItemTemplate>
        <DataTemplate>
               <Expander  x:Name="expanderHeader" IsExpanded="{Binding Mode=TwoWay, Path=IsSelected, RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}}">
                 <!-- Content -->
                </Expander>
        </DataTemplate>
    </ListBox.ItemTemplate>

If you prefer you can use the binding, mode = OneWayToSource, depending on your needs ..