Tab Order and Readonly Cells

enableEditTabOnly method allows to navigate only between editable cells.
And by setExternalTabOrder method you can set external elements, which get focus when tab|tab+shift is pressed in the last|first cell.

 
<input type="text" id="elem1" value="start" size="20">
<div id="gridbox" width="400px" height="250px" style="background-color:white;overflow:hidden;"></div>
<input type="text" id="elem2" value="end" size="20">
 
 
<script>
    mygrid = new dhtmlXGridObject('gridbox');
    mygrid.setHeader("Column A,Column B,Column C");
    mygrid.setColTypes("ro,ed,ed");
 
    mygrid.enableEditTabOnly(1);
 
    mygrid.setExternalTabOrder("elem1","elem2")
    ....
<script>