Hi Alex,
Thanks for using Syncfusion products.
We handle the GotFocus and change the focus to another focusable control when the original source is grid.
Please download the sample from the below location.
http://www.syncfusion.com/uploads/redirect.aspx?file=TabbingIssueForum92379_f95b3152.zip&team=developmentLet us know if you have any questions.
With Regards,
Dhinesh Pandiyan