a1.xml

<?xml version="1.0"?>
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="System.Windows.Window" Title="WPF" Height="100" Width="300">
  <StackPanel Orientation="Horizontal">
    <TextBlock Margin="5" VerticalAlignment="Center">
            Enter Password:
        </TextBlock>
    <PasswordBox Name="passwordBox" PasswordChar="!" VerticalAlignment="Center" Width="150"/>
    <Button Content="OK" IsDefault="True" Margin="5" Name="button1" VerticalAlignment="Center"/>
  </StackPanel>
  <!--   

creating the Click="button1_Click" attribute on Button element leads to the following:
           Exception calling "Load" with "1" argument(s): 
           
          "Failed to create a 'Click' from the text 'Button1_Click'."
http://social.msdn.microsoft.com/Forums/vstudio/en-US/753be353-a2f9-4b29-ba75-cd962a7260a4/dynamic-xaml-and-attaching-event-handlers-problem-wpf-4?forum=wpf

        <x:Code>
        private void button1_Click(object sender, RoutedEventArgs e){
            MessageBox.Show("Password entered: " + passwordBox.Password,Title);
        }
        </x:Code>
   -->
</Window>