Set style for Control in UserControl

I have a issue with set style for Control in UserControl.

1 - I create a UserControl wrapper PasswordBox(need to override some method for PasswordBox) :

<UserControl
    x:Class="Test.WrapperPasswordBox"
    xmlns="http://ift.tt/w9rHWX;
    xmlns:x="http://ift.tt/zZkFEV;
    xmlns:local="using:Test"
    xmlns:d="http://ift.tt/PuXO1J;
    xmlns:mc="http://ift.tt/R4RR6u;
    mc:Ignorable="d">
    
    <Grid>
        <PasswordBox x:Name="PasswordBox" />
    </Grid>
</UserControl>

2 - I create a Style in App.xaml:

            <Style TargetType="PasswordBox"
                   x:Key="GlobalPasswordBox">
                <Setter Property="FontSize"
                        Value="30" />
                <Setter Property="Height"
                        Value="50" />
            </Style>

3 - I replace PasswordBox with WrapperPasswordBox in MainPage.xaml :

<PasswordBox Style="{StaticResource GlobalPasswordBox}">

==>

<WrapperPasswordBox Style="{StaticResource GlobalPasswordBox}">

My issue is : When i run to MainPage.xaml, application will crash.

I know : can't set style of PasswordBox for UserControl. But i can't move Style in MainPage.xaml to PasswordBox of UserControl because i have another style for PasswordBox in another Page.

Do you have any suggestion for this issue ?