protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.PasswordChanged += OnPasswordBoxValueChanged;
// using _value saved before in OnPropertyChanged
if (CachedValue != null)
{
if (CachedValue.Length == 0)
{
AssociatedObject.Password = string.Empty;
}
else
{
AssociatedObject.Password = CachedValue.ConvertToUnsecureString();
}
}
}