I am trying to apply watermark on a PasswordBox using XAML, it applied perfectly but not hiding the watermark when password is typed in.

Password watermark not hiding in picture:

My tried XAML style resource for PasswordBox :

<Application.Resources>
    <Style x:Key="PasswordStyle" TargetType="PasswordBox" >
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="PasswordBox">
                    <Border MinWidth="{TemplateBinding MinWidth}">
                        <Grid>
                            <StackPanel Margin="8">
                                <ScrollViewer x:Name="PART_ContentHost"/>
                            </StackPanel>
                            <StackPanel>
                                <TextBlock Name="PART_TempText" Text="Enter Password" Foreground="#807C7C"
Visibility="Collapsed" TextAlignment="Center" HorizontalAlignment="Center" Padding="8" />
                            </StackPanel>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <DataTrigger Binding="{Binding Password.Length, RelativeSource={RelativeSource Self}}" Value="0">
                            <Setter TargetName="PART_TempText" Property="Visibility" Value="Visible" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding Password.Length, RelativeSource={RelativeSource Self}}" Value="1">
                            <Setter TargetName="PART_TempText" Property="Visibility" Value="Collapsed" />
                        </DataTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Application.Resources>

And the `PasswordBox` XAML code:

 <PasswordBox Grid.Row="6" x:Name="txtPassword" HorizontalAlignment="Center" Width="200" HorizontalContentAlignment="Center" VerticalAlignment="Center" KeyUp="txtPassword_KeyUp"
             Style="{StaticResource PasswordStyle}" />

I want to hide the watermark when user start typing in the `PasswordBox` using XAML.

You any help related to XAML will be appreciated!