I am having the same problem but according to the release notes it as fixed on the April 12th build.
Package Version 1.1.5181.0 – April 12, 2005 # Xceed Editors for .NET 1.0 *Fixed problem setting the data source of a WinComboBox. *Allow setting same control as DropDownControl more than once. *Allow “Shift-Tab” to move focus to previous control from a control with a text area. *Removed Authenticode signature.
I noticed there is a new build Sept 1st, I will upgrad to that and check it out again.
Imported from legacy forums. Posted by Shawn (had 3300 views)