ComboBox SelectionChanged command handler is not fired.

[sam-wheat]

Repo is here.

I got lucky and guessed a way to make ItemsControl work - my luck has run out with Combobox.

Templated control vs custom control : microsoft/microsoft-ui-xaml#3371

Themes/Generic.xaml:

ItemsControl - works:

<ItemsControl x:Name="peopleItemsControl"
			  ui:FrameworkElementExtensions.AncestorType="local:PeopleControl"
			  ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=People}" >
	<ItemsControl.ItemTemplate>
		<DataTemplate>
			<ToggleSwitch ui:FrameworkElementExtensions.AncestorType="local:PeopleControl" OnContent="{Binding Name}" OffContent="{Binding Name}" >
				<Interactivity:Interaction.Behaviors>
					<Interactions:EventTriggerBehavior EventName="Toggled">
						<Interactions:InvokeCommandAction 
							Command="{Binding (ui:FrameworkElementExtensions.Ancestor).TogglePersonCommand, 
							ElementName=layoutRoot, Mode=TwoWay}" 
							CommandParameter="{Binding}">
						</Interactions:InvokeCommandAction>
					</Interactions:EventTriggerBehavior>
				</Interactivity:Interaction.Behaviors>
			</ToggleSwitch>
		</DataTemplate>
	</ItemsControl.ItemTemplate>
</ItemsControl>

Combobox - does not work:

<ComboBox
	ui:FrameworkElementExtensions.AncestorType="local:PeopleControl"
	Width="150"
	DisplayMemberPath="Name"
	ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=People}" 
	SelectionChangedTrigger="Always" >
	
	<!--Command="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TogglePersonCommand}"-->
	<Interactions:EventTriggerBehavior EventName="SelectionChanged">
		<Interactions:InvokeCommandAction 
			Command="{Binding (ui:FrameworkElementExtensions.Ancestor).TogglePersonCommand, 
			ElementName=layoutRoot, Mode=TwoWay}"
			CommandParameter="{Binding SelectedItem}">
		</Interactions:InvokeCommandAction>
	</Interactions:EventTriggerBehavior>
</ComboBox>

PeopleControl.cs:

	TogglePersonCommand = new AsyncRelayCommand<object>(TogglePersonCommandHandler, (o) =>
    {
        return true; // never fired for combobox
    });