Hi Cyril,
Thanks for your interest in Syncfusion products.
Version 9.1.0.24 was a service pack release for WPF / Silverlight products, this fix is made available in volume 2 2011, (v 9.2.0.137).
Upgrading to latest version 9.2.0.138 is recommended.
http://www.syncfusion.com/downloads/latest-versionPlease let us know if you need any further details.
Regards
Vallarasu S.