selected row cleared but still acting as if selected

I have 2 grids, obj and obj_s

When i select a row on obj and then clear it:-
obj.setSelectedRows([]);

i then call a function
function siteSearch()
{
var selectedOrg = obj.getCurrentRow();
var orgresult = obj.getCellValue(0, selectedOrg);
}

which should not be able to find a selected row, but it does, the last selected one, even though this is not showing as selected.

Anyone got any ideas how to work around this?

many thanks Kevin