BewildrTestApp.Window1.wait_for_existence_button_Click C# (CSharp) Method

        private void wait_for_existence_button_Click(object sender, RoutedEventArgs e)
        {
            //wait for a bit
            Thread.Sleep(1000);
            //make a new element appear
            System.Windows.Controls.Button myMagicButton = new Button();
            myMagicButton.Content = "suddenly exists";
            stackPanel1.Children.Add(myMagicButton);
        }