public class TextBoxSelector
{
    public static readonly DependencyProperty SelectAllOnFocusProperty =
        DependencyProperty.RegisterAttached(
            "SelectAllOnFocus", 
            typeof(bool), 
            typeof(TextBoxSelector), 
            new PropertyMetadata(OnSelectAllOnFocusPropertyChanged));

    private static void OnSelectAllOnFocusPropertyChanged(
        DependencyObject sender, 
        DependencyPropertyChangedEventArgs e)
    {
        FrameworkElement element = sender as FrameworkElement;
        if (element != null)
        {
            if ((bool)e.NewValue)
                element.GotFocus += OnFocus;
            else
                element.GotFocus -= OnFocus;
            
        }
    }

    public static bool GetSelectAllOnFocus(
        DependencyObject o)
    {
        return (bool)o.GetValue(SelectAllOnFocusProperty);
    }

    public static void SetSelectAllOnFocus(
        DependencyObject o, 
        bool selectAll)
    {
        o.SetValue(SelectAllOnFocusProperty, selectAll);
    }

    static void OnFocus(object sender, RoutedEventArgs e)
    {
        TextBox focusedTextBox = 
            FocusManager.GetFocusedElement() as TextBox;
        if (focusedTextBox != null)
        {
            focusedTextBox.SelectAll();
        }
    }
}

xmlns:ui="clr-namespace:SelectionDemo.Helper"

<Grid 
  Grid.Row="0" 
  Grid.Column="0"
  ui:TextBoxSelector.SelectAllOnFocus="true">

  <TextBox Text="{Binding FirstName}"/>
  <TextBox Text="{Binding LastName}"/>

</Grid>

1. Auf diese Seite gehen: http://visitmix.com/opencallvote/
2. Im Suchfeld nach "Mario Meir-Huber" suchen und dann auf "Add This Entry to Ballot" klicken (Link ist unten)
3. Dann auf "Submit Your Ballot" im rechten Feld klicken.

<Grid x:Name="LayoutRoot" Background="White">
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    
    <Rectangle x:Name="VideoVisualization" 
               Grid.Row="0" 
               Grid.Column="0"
               Grid.ColumnSpan="2"
               Margin="30">
        <Rectangle.Effect>
            <DropShadowEffect BlurRadius="15"
                              Color="Black"
                              ShadowDepth="4"/>
        </Rectangle.Effect>
    </Rectangle>

    <Button x:Name="TurnOnButton" 
            Content="Turn on Webcam" 
            Grid.Row="1"
            Grid.Column="0"
            Click="TurnOnButton_Click"
            Margin="5"/>
    <Button x:Name="TurnOffButton" 
            Content="Turn off Webcam" 
            Grid.Row="1"
            Grid.Column="1"
            Click="TurnOffButton_Click"
            Margin="5"/>
</Grid>

• CaptureDeviceConfiguration - Stellt den Zugriff auf das Standard-Video Capturing Device zur Verfügung, als auch den Zugriff auf die Audio-Funktionalität. Ebenfalls kann darüber der Zugriff auf die Komponente angefordert werden.
• CaptureSource - Klasse für das tatsächliche Capturing
• VideoBrush - Zeichnet den tatsächlichen Videobereich

public class WebcamHandler
{
    private VideoCaptureDevice videoDevice;
    private CaptureSource source;
    private Shape visualizationElement;

    public Shape VisualizationElement
    {
        get { return visualizationElement; }
        set { visualizationElement = value; }
    }

    public void Start()
    {
        videoDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();

        if (CaptureDeviceConfiguration.RequestDeviceAccess())
        {
            if (source != null)
            {
                source.Start();
                return;
            }

            source = new CaptureSource();
            source.VideoCaptureDevice = videoDevice;

            VideoBrush videoBrush = new VideoBrush();
            videoBrush.SetSource(source);
            videoBrush.Stretch = Stretch.UniformToFill;

            source.Start();

            VisualizationElement.Fill = videoBrush;
        }
    }

    public void Stop()
    {
        source.Stop();
    }
}

public partial class MainPage : UserControl
{
    WebcamHandler webcam = new WebcamHandler();

    public MainPage()
    {
        InitializeComponent();
    }

    private void TurnOnButton_Click(object sender, RoutedEventArgs e)
    {
        webcam.VisualizationElement = VideoVisualization;
        webcam.Start();
    }

    private void TurnOffButton_Click(object sender, RoutedEventArgs e)
    {
        webcam.Stop();
    }
}