WPF WebBrowser不显示页面

Question

我创建了一个带有UserControl的WPF WebBrowser。它在运行后加载页面但不显示加载的页面。

<UserControl x:Class="PsyboInventory.Tiles.About.AboutTile"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="500" d:DesignWidth="800">
    <Grid>
        <WebBrowser x:Name="browser" Height="253" Margin="300,96,36,0"  VerticalAlignment="Top"/>
    </Grid>
</UserControl>

关于cs代码

public AboutTile()
{
    InitializeComponent();

    try
    {
        browser.Loaded += delegate
        {
            browser.Navigate("http://www.google.fi/");
        };
    }
    catch { }
}