Binding RadioButton IsChecked for ListBoxItem IsSelected and ListBox IsFocused

I've seen other questions very similar to this, but somehow I still can't get it to work. Here's the script.

What I have I have ListBox

that displays a list of my view models. Each view model has a list of children that appear in another, nested list. I am using DataTemplate

to achieve this.

What I want I want the children elements to have RadioButton

which is selectable when selected ListBoxItem

and when ListBox

has focus (inner ListBox

).

Currently the part IsSelected

above works fine, however when I switch from one viewmodel to another (i.e. the first ListBox loses focus) the radio button on the first one ListBox

remains selected.

Here is the code:

        <Style TargetType="{x:Type ListBox}">
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}" >
                    <Setter Property="Margin" Value="2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <RadioButton Focusable="False">
                                    <RadioButton.Style>
                                        <Style TargetType="{x:Type RadioButton}">
                                            <Style.Triggers>
                                                <DataTrigger Binding="{Binding Path=IsFocused, Mode=OneWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBox}}}" Value="False">
                                                    <Setter Property="IsChecked" Value="False"/>
                                                </DataTrigger>
                                            </Style.Triggers>
                                        </Style>
                                    </RadioButton.Style>
                                    <RadioButton.IsChecked>
                                        <Binding Path="IsSelected" Mode="TwoWay" RelativeSource="{RelativeSource TemplatedParent}" />
                                    </RadioButton.IsChecked>
                                    <ContentPresenter></ContentPresenter>
                                </RadioButton>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>

      

        
        
        
      

    

I also tried MultiBinding

but that didn't work either. Any suggestions?

UPDATE Update to include my attempt in MultiBinding

:

<ControlTemplate TargetType="{x:Type ListBoxItem}">
<RadioButton>
<RadioButton.IsChecked>
    <MultiBinding>
        <MultiBinding.Converter>
            <DataExportTool:AllTrueConverter/>
        </MultiBinding.Converter>
        <Binding Path="IsSelected" Mode="TwoWay" RelativeSource="{RelativeSource TemplatedParent}"/>
        <Binding Path="IsFocused" Mode="OneWay" RelativeSource="{RelativeSource TemplatedParent}"/>
    </MultiBinding>
</RadioButton.IsChecked>
<ContentPresenter/>
</RadioButton>
</ControlTemplate>

      

        
        
        
      

    

And the converter:

public class AllTrueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        return values.Cast<bool>().All(x => x);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        return Enumerable.Repeat((bool)value, 2).Cast<object>().ToArray();
    }
}

      

        
        
        
      

    

Some of this IsSelected

works great, i.e. only one item in the list has a radio balance selected at any time. However, when the control loses focus, the selected radio button is still selected (not what I want).