windows-phone-8.1 - TextTrimming 使用自定义字体失败

Question

文本修剪不适用于自定义字体。关于如何解决这个问题的任何线索？

<TextBlock x:Name="PageTitle" Text="i want to put a really long text " TextAlignment="Center" TextTrimming ="WordEllipsis" Foreground="#FFE89192"  Width="350"/>