ToolTipService.ToolTip换行

<TextBlock TextTrimming="WordEllipsis"   VerticalAlignment="Center" Width="600" Text="{Binding Content}">
                                 <ToolTipService.ToolTip>
                                     <ToolTip>
                                         <TextBlock TextWrapping="Wrap" Width="400" Text="{Binding Content}"/>
                                     </ToolTip>
                                 </ToolTipService.ToolTip>
                                </TextBlock>