Why Won't the Silverlight ChildWindow Display?

问题:

I have a simple Silverlight 4 application and have added a child window to it. I am using the below code to open it on a button click. This seems like it should work, does it not?

public void btnAbout_Click(object sender, RoutedEventArgs e)
        {
            About aboutThis = new About();
            aboutThis.Show();
        }

The "About" class looks like this:

public partial class About : ChildWindow
    {
        public About()
        {
            InitializeComponent();
        }

        private void OKButton_Click(object sender, RoutedEventArgs e)
        {
            this.DialogResult = true;
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.DialogResult = false;
        }
    }

回答1:

I don't see any reason why it should not work.

Samples:

http://www.tanguay.info/web/index.php?pg=codeExamples&id=135

http://www.silverlighttoys.com/Tutorials.aspx?tutorial=2

What is your XAML like?

回答2:

Try setting the Width and Height to 600px by 600px of your About Childwindow from xaml.