Hello paralleles,

You can use the AfterCellUpdateEvent to capture when the value is changed. Then you can interrogate the cell index to verify which column is triggering the event:

function UltraWebGrid1_AfterCellUpdateHandler(gridName, cellId){
    var cell = igtbl_getCellById(cellId);
    if (cell.Index == 0)
    {
        //do work
    }
}

Hope that helps.