We had issues with WindowsXP SP1 and SmartUI ActiveX. Make sure that you are using the latest version of our control : http://download3.xceedsoft.com/Packages/2.2.6415.0/XceedComponents.exe
If the issues does persists, please contact us directly with more details about your development environment : support @ xceedsoft.com
Mathieu Drimonakos
-Technical Designer-