bitwarden-android/src/UWP/Styles.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:uwp="using:Xamarin.Forms.Platform.UWP"
    xmlns:local="using:Bit.UWP">

    <local:IconConverter x:Key="IconConverter" />

    <Style x:Key="TabbedPageStyle2" TargetType="uwp:FormsPivot">
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Vertical">
                        <Image Source="{Binding Icon, Converter={StaticResource IconConverter}}" Width="24" Height="24" />
                        <TextBlock Name="TabbedPageHeaderTextBlock" Text="{Binding Title}"
                                   Style="{ThemeResource BodyTextBlockStyle}" />
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>