Hi Nimrod ,
Thanks for your interest in syncfusion products.
Please have the below sample to achieve your requirements of changing the style color to gradient on mouse move in RibbonControlAdv.
[sample link]
http://www.syncfusion.com/downloads/Support/DirectTrac/102856/sample1122-528646880.zip
Please let us know if you have any concerns.
Regards,
Paul Anderson S