silverlight textblock 自动换行
<TextBlock Height="178" Name="textBlock1" Text="TextBlock我是中国人" TextWrapping="Wrap" MaxWidth="35" VerticalAlignment="Top" Margin="252,12,-252,0" />
<TextBlock Height="178" Name="textBlock1" Text="TextBlock我是中国人" TextWrapping="Wrap" MaxWidth="35" VerticalAlignment="Top" Margin="252,12,-252,0" />