<Border>
<Border.Style>
<Style TargetType="{x:Type Border}">
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="BorderBrush" Value="Blue"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Hidden"/>
<Setter Property="Margin" Value="5"/>
<Setter Property="Padding" Value="5"/>
</Style>
</Border.Style>
<WindowsFormsHost Height="180" Width="420" Background="Black">
<AI:AxGRDisplayViewer x:Name="_viewer" Visible="False"/>
</WindowsFormsHost>
</Border>
请问这个是什么?那个命名空间? <AI:AxGRDisplayViewer x:Name="_viewer" Visible="False"/>