Hi Andy,
By default, the grid uses the tab key to move from cell to cell. But if you want the tab key to move from control to control on your form, then you can set the WantTabKey property.
this.gridControl1.WantTabKey = false;
If you want to capture the TAB key when the current cell is in edit mode, you have to overide either the ProcessCmdKey or ProcessDialogKey as shown in this KB article.
http://www.syncfusion.com/Support/article.aspx?id=10441
Regards,
Jay N