WPF - 组合框切断了标题

Question

我有以下带有分组框的XAML ......

<Window x:Class="EliteFax.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:EliteFax"
        mc:Ignorable="d"
        Title="Fax" Height="363.683" Width="477.469">
    <GroupBox Header="Page Editor:" Margin="10,0"/>
</Window>

然而，看起来像这样......

注意'g'被切断了。这是如何解决的？