Hi Edu,
Thank you for your interest in Syncfusion products.
The reported issue is already a known issue which is fixed and included in Essential Studio 2010 volume 1 release. We suggest you to upgrade to our latest version to resolve this issue. Please refer the below link to download the same.
http://www.syncfusion.com/downloads/latest-versionLet me know your concerns.
Regards,
Bharath M