I just found it right before you responded, but didn't get back to my posting in time to add the info I had found. It seems that it comes up in IntelliSense when you type part of it, but it should also show in the PEM box, buit it isn't there. I wonder if the first service pack for ASP.NET 4.0 will make sure it shows up?

>>I do not see OnTextChanged when I look at a TextBox in VS 2010, nor in VS 2008. Did I miss something?

>Try manually typing it in the ASPX declaration - will it work?

>Also search here - this exact problem was recently discussed.