Silverlight 中嵌入ASP.NET页面，有个警告提示怎么去掉

[YnSky]

嵌入功能已经实现，但是每次都会提示下面这个警告，每次都要点一下，请问怎么去掉警告？
warning : The htmlhost control should always be used with a winodwless plugin. it cannot work reliably if this property is not specified


嵌入代码是：
Divelements.SilverlightTools.HtmlHost testHost = new Divelements.SilverlightTools.HtmlHost();

testHost.SourceUri = new Uri("http://localhost:9041/WebForm1.aspx");
Grid.SetRow(testHost, 1);
testContainer.Children.Add(testHost);