ScrollViewer ignores ContentTemplateSelector

Question

I've faced with issue, using ScrollViewer.
Here's sample view models:

public class A
{
    public string Text { get; set; }
}

public class B
{
    public int Number { get; set; }
}

...and DataTemplateSelector:

public class ViewModelTemplateSelector : DataTemplateSelector
{
    public DataTemplate ATemplate { get; set; }
    public DataTemplate BTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if (item is A)
            return ATemplate;

        if (item is B)
            return BTemplate;

        return base.SelectTemplate(item, container);
    }
}

XAML:

<Grid>
    <Grid.Resources>
        <local:ViewModelTemplateSelector x:Key="ViewModelTemplateSelectorKey">
            <local:ViewModelTemplateSelector.ATemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Text}"/>
                </DataTemplate>
            </local:ViewModelTemplateSelector.ATemplate>
            <local:ViewModelTemplateSelector.BTemplate>
                <DataTemplate>
                    <TextBox Text="{Binding Number}"/>
                </DataTemplate>
            </local:ViewModelTemplateSelector.BTemplate>
        </local:ViewModelTemplateSelector>
    </Grid.Resources>

    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>

    <ListBox x:Name="ListBox" ItemsSource="{Binding}"/>
    <ScrollViewer   Grid.Row="1" Content="{Binding SelectedItem, ElementName=ListBox}"  
                    ContentTemplateSelector="{StaticResource ViewModelTemplateSelectorKey}"/>
    <ContentControl Grid.Row="2" Content="{Binding SelectedItem, ElementName=ListBox}"                       
                    ContentTemplateSelector="{StaticResource ViewModelTemplateSelectorKey}"/>
</Grid>

This is what is going on, when any item is selected in ListBox:

As you can see, ScrollViewer ignores ContentTemplateSelector, while ContentControl does not. ScrollViewer is inherited from ContentControl, and at first look, there's no reason for such behavior.

I know, that if I'll declare implicit data templates for A and B, ScrollViewer will handle them correctly, but this is not an option for my real application.

Is this known bug? Or am I missing something?

UPD.

I've submitted an issue on MS Connect.

Answer 1

I did not test the syntax. If it is wrong just let me know and I will delete
This is what I would try

<ScrollViewer Grid.Row="1">
    <ContentControl Content="{Binding SelectedItem, ElementName=ListBox}"                       
                    ContentTemplateSelector="{StaticResource ViewModelTemplateSelectorKey}"/>
</ScrollViewer>

Answer 2

This should do the trick:

    <ScrollViewer Grid.Row="1">
        <ContentPresenter Content="{Binding SelectedItem, ElementName=ListBox}"  ContentTemplateSelector="{StaticResource ViewModelTemplateSelectorKey}" />
    </ScrollViewer>