public void TestScrollViewerOnExpander()
{
Expander exp = DefaultExpanderToTest;
exp.Width = 200;
exp.Height = 400;
exp.Header = "MyExpander";
exp.HorizontalContentAlignment = HorizontalAlignment.Stretch;
ScrollViewer sv = new ScrollViewer();
sv.Height = 50;
TextBlock tb = new TextBlock();
tb.Width = 300;
tb.Height = 100;
tb.Text = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua";
tb.TextWrapping = TextWrapping.Wrap;
sv.Content = tb;
exp.Content = sv;
exp.IsExpanded = true;
Point pt = new Point();
ToggleButton tgbn = new ToggleButton();
TestAsync(
exp,
() => Assert.IsTrue(sv.Visibility == Visibility.Visible),
() => Assert.IsTrue(sv.VerticalScrollBarVisibility == ScrollBarVisibility.Visible),
() => pt = sv.TransformToVisual(exp).Transform(new Point(0, 0)),
() => tgbn = (ToggleButton)TestExtensions.GetChildrenByType(exp, typeof(ToggleButton)),
() => Assert.IsTrue(TestExtensions.AreClose((exp.ActualHeight - tgbn.ActualHeight - sv.ActualHeight) / 2, pt.Y - tgbn.ActualHeight)));
}
