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updateFromXML

I have a grid with subrows. I am using updateFromXML via window.setInterval call (every 20 seconds). If a subrow is opened when this update is fired. The subrow is automatically closed. I know I can add a function that is fired after updateFromXML. But not sure how to "reopen" the subrow (or subrows) that were opened prior to the update.

You can use open() cell's method
mygrid.cellById(rowId,cellIndex).open();
http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:methods_specific_for_some_excells#sub_row_sub_row_grid_sub_row_ajax