问带有滚动视图的全屏弹出窗口

EN

Popup testPopup = new Popup();

StackPanel testStackPanel = new StackPanel();

ScrollViewer testScrollViewer = new ScrollViewer();
testScrollViewer.Background = new SolidColorBrush(Windows.UI.Colors.Green);
testScrollViewer.Height = new GridLength(1, GridUnitType.Star).Value; //this sets the height to one pixel     instead of filling the screen.

Button testPopupButton = new Button();
testPopupButton.Content = "click";
testPopupButton.Click += delegate(object sender, RoutedEventArgs e)
{
    testPopup.IsOpen = true;
};

Button closePopupButton = new Button();
closePopupButton.Content = "close";
closePopupButton.Click += delegate(object sender, RoutedEventArgs e)
{
    testPopup.IsOpen = false;
};

for (int i = 0; i < 20; i++)
{
    Button b = new Button();
    b.Content = i;

    testStackPanel.Children.Add(b);
}

testStackPanel.Children.Add(closePopupButton);

testPopup.Child = testScrollViewer;
testScrollViewer.Content = testStackPanel;
ContentRoot.Children.Add(testPopupButton);
ContentRoot.Children.Add(testPopup);