I am trying to work with the AJAX AsyncPostBackTrigger class in the System.Web.Extensions 3.5assembly. I am in VS 2008 and the project is targeted for .NET 3.5.
In the IDE, the source for Default.asp, I am getting a warning (wavy green line) for the <Triggers> tag and the <asp:AsyncPostBackTrigger> tag. The cue for the Triggers tag is "XHTML 1.0 Transitional - element triggers is not supported".
for the other tag it is saying it is not a known element. Intellisense doesn't even list the <asp:AsyncPostBackTrigger>
Anybody have any suggestions what I may be missing? The System.Web.Extensions v 3.5 is listed in the Web.Config file and is in the project references.
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