Two autocomplete extenders on page, second wont fire

It appears that this is a bug, and has to do with the fact that I am setting the focus of the second box on the page load. I found a related post:http://forums.asp.net/p/1171008/1959838.aspx

This worked for me, in my case I was setting the focus on the Page_Load method.. i.e. TextBoxControl.Focus()
Using the script from the linked post, I was able to set which of the two text boxes should get focus from my config, then I called

ClientScript.RegisterScriptBlock to output that script into the client page code. It fires when the page loads client side, and the focus is given with the autocomplete extender working properly.