ComboBox Dropdown Button swallows first key

If you click on the dropdown arrow of a ComboBox and then type a letter, that first letter is ignored in the search. Has anyone already worked around this?

Here is a repro:

• Go to the sample ComboBox at http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/ComboBox/ComboBox.aspx
• Click on the dropdown arrow (so that the list appears)
• Type the letter "J". Instead of going to the first list item starting with "J", the KeyPress is swallowed.
• Type the letter "J" again. This time you are brought to the first item starting with "J"

I looked through the JS and sure enough it is just setting focus to the textbox on the first key press. Before I start messing around in there I was wondering if someone had already tweaked this behavior?