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<TextBox x:Name="PasswordTextBox"
PasswordChar="鈼?quot;
Width="200"
Height="30"
Margin="10"
VerticalAlignment="Center"
HorizontalAlignment="Center"
FontSize="16"
PasswordBox.Password="Password"
PreviewMouseDown="PasswordTextBox_PreviewMouseDown" />

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private void PasswordTextBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (PasswordTextBox.Password == "Password")
{
PasswordTextBox.Password = "";
}
}

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