sets elements which get focus when the Tab button is pressed in the last or in the first (Tab+Shift) cell
| start | string|number|HTMLElement | HTML object or its id - gets focus when Tab+Shift are pressed in the first cell | 
| end | string|number|HTMLElement | HTML object or its id - gets focus when Tab is pressed in the last cell | 
mygrid.setExternalTabOrder("elem1","elem2");
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