Not able to accesss Table Veiw Values

Hi All,
I have created a Tableview and the values are displayed perfectly. I have used vectors to populate the rows and columns.
Vector colName = new Vector();
colName.addElement("Description");
colName.addElement("Due");
colName.addElement("Expected");
colName.addElement("Completed");
Vector data = get_dates();
model = new DefaultTableViewModel(data, colName);
Im trying to retrieve values using
public IPageContext context = this.getPageContext();
loopcount = 0;
for (int i = firstrow; i <= lastrow_model; i++) {
loopcount = loopcount + 1;
AbstractDataType data_des=context.getDataForComponentId
("titleTableView","Description",loopcount);
<b>But Im getting data_desc as null.</b>
Why is this happening and what wrong im doing. How can I get values from table. Im in process of adding new row to the table. Any help is appreciated.
Thanks,
Praveen

I've solved it on my own. Now I'm able to access values. But I have button called add and when I click on the add button I wanted to know the easiest way of adding a row to the existing model. Or do I have to re-create entire model.
Thanks,
Praveen

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Not able to accesss Table Veiw Values

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