Password TextBox in WPF

In .NET Framework 3.0 (WPF) Microsoft have removed the property of a TextBox, which specifies whether the textbox is Password or Normal type. But in replacement they've introduced a new control named PasswordBox which is very simple and intuitive to use. Here is a simple example:
<PasswordBox x:Name="txtPassword"

By default the PasswordChar is set to the big black dot from Windows XP style logon and.
In order to detect changes in the password you must handle the PasswordChanged event:

VB Codebehind:
Private Sub txtPassword_PasswordChanged(ByVal sender As System.Object _
                  , ByVal e As System.Windows.RoutedEventArgs _
                 ) Handles txtPassword.PasswordChanged
      'Validate input
End Sub

An in order to retrieve the typed password you just use the Password property of the PasswordBox control:

VB Codebehind:
Public Function IsAuthenticated() as Boolean
   Return txtPassword.Password <> ""
End Function

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