Required library edition:
Required library file: dhtmlxgrid.js

sets elements which get focus when tab is pressed in the last or first (tab+shift) cell

• start - html object or its id - gets focus when tab+shift are pressed in the first cell
• end - html object or its id - gets focus when tab is pressed in the last cell

   mygrid.setExternalTabOrder("elem1","elem2");

See also: enableEditTabOnly, setTabOrder