How to keep the selected row after refreshing Grid?

I want to keep the selected row after refreshing Grid, can anyone help me?
Thanks!!!

var selectedIndex = obj.getProperty("selection/index");
obj.refresh();
obj.setProperty("selection/index", selectedIndex );

Cheers,

Thanhks!!!!

If I want to refresh the Grid in a original window from popup window, I will have to do?
Can you help me?

parent.obj.refresh();

Only if popup is generated using window.open() and have not been reloaded. Once popup content is reloaded, it forgets 'parent' reference. No know work around if reloaded :-(