Tab in datagrid

[Hershel Fisch]

Hi, I feel a bit bad for everybody getting bombarded questions regarding
datagrid, 
But it is a very important feature and needs to be understood properly.
So I¹m sorry for it BUT we got to get it to work.
Question, How do I achieve a fld identification e.g. Line 3 fld 4 or a name
or whatever  via the tab key and then by leaving that particular fld
triggering a closeField?
Thanks, Hershel