ADA and Intellisense

All the pages I develop demands Section 508 complaince. And to achieve
this, MS (Microsoft, duh!) recommends installing a June 2003 hotfix for
1.1 (yes, I am still using the "old" version :-)). This, they tell,
would support AssociatedControlID property in the control.

I did install the hotfix and it doesn't seem to work as expected. The VS.NET IDE
still shows that annoying red squigley line under the
AssociatedControlID, but does not give any compilation errors.

I did google and it seems many of ASP.NET developers face this issue.
As a result of my recent adventure in creating Custom Server Controls
and ADA complaince, I think that the hot fix does not UPDATE the
asp.xsd (which drives the Intellisense in VS.NET IDE) file.

Did any one (1.1 users) face this kind of issue lately?