.net 背景色

我有以下DGML，是从中复制的

当我在Visual Studio 2017中打开它时，颜色被忽略

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类别应在其自己的类别标签内，如下所示：

<?xml version="1.0" encoding="utf-8"?>  
<DirectedGraph Title="DrivingTest" xmlns="http://schemas.microsoft.com/vs/2009/dgml">  
   <Nodes>  
      <Node Id="Driver" Label="Student" Category="Person" />  
      <Node Id="Passenger" Label="Instructor" Category="Person" />  
      <Node Id="Car" Label="Car" Category="Automobile" />  
      <Node Id="Truck" Label="Truck" Category="Automobile" />  
   </Nodes>  
   <Links>  
      <Category Id="Person" Background="Orange" />  
      <Category Id="Automobile" Background="Yellow"/>  
      <Link Source="Driver" Target="Car" Label="Passed" Stroke="Black" Background="Green" Category="PassedTest" />  
      <Link Source="Driver" Target="Truck" Label="Failed" Stroke="Black" Background="Red" Category="PassedTest" />  
   </Links>  
</DirectedGraph>