using display tag in jsp

Hello Folks,

I am facing a problem in using display tag in jsp. Consider a scenerio i have
RowVO & ColumnVO. In RowVO i have the List collecton in which ColumnVo object is stored.

Means in java code i will iterate like this :
if dataRows List contain the RowVO List then

for(int i =0; i < dataRows.size(); i++){
RowVO rowObj = (RowVO)datoRows.get(i);
columnData = rowObj.getObjColVoList();
for(int j =0; j < columnData.size(); j++){
ColumnVO objColVo = (ColumnVO)columnData.get(j);
System.out.println("Col value per row=>"+objColVo.getValueS());
}
}

But this thing i want to display in jsp & with using displaytag under display-column. Please give the needful solution??

Thanks in Advance