I have made a sample demo VS 2010 RC sample project, because in my production project I have the same error using MVVM.

In my sample demo project I use only Code-behind without 3rd party dependencies so you can download the demo project here and run it for yourself: http://www.sendspace.com/file/mwx7wv

Now to the problem: When I click the girls/boys button it should switch the datatemplate, not?

What do I wrong?

OK I offer here a code snippet too:

Code-Behind MainWindow.cs:

namespace ContentTemplateSelectorDemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        Person person;

        public MainWindow()
        {
            InitializeComponent();

            person = new Person(){ Gender = "xxx"};
            person.IsBoy = true;    

            ContentGrid.DataContext = person;
        }

        private void btnBoys_Click(object sender, RoutedEventArgs e)
        {
            person.IsBoy = true;
            person.IsGirl = false;
            this.ContentGrid.DataContext = person;
        }

        private void btnGirls_Click(object sender, RoutedEventArgs e)
        {
            person.IsGirl = true;
            person.IsBoy = false;
            this.ContentGrid.DataContext = person;    
        }        
    }
}

XAML MainWindow.xaml:

<Window x:Class="ContentTemplateSelectorDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:ContentTemplateSelectorDemo"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>            
        <DataTemplate x:Key="girlsViewTemplate">
wpf datatemplate contenttemplateselector
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