when I do the following action:
myultracombo.performaction(ultracombo.Dropdown)
Hm, I'm not sure what's causing it, then. What key are you using to trigger the dropdown?
You should probably submit this issue to Infragistics Developer Support with a sample demonstrating the behavior so they can check it out.
Submit an incident to Infragistics Developer Support
I am calling this from the keypress event. Also, I am not setting the autofitstyle on the combo.
From what event are you calling this code?
Are you setting AutoFitStyle on the combo? If so, try taking that out and see if it helps.