How to set the values to a field?

I have created a page which is used to create the records by using "Add Another Row" button.
If i click on "Add Another Row",a blank row will be created.
The requirement is,after clicking the "Add Another Row" , a default value should be set to one of the fields of the blank row.
Can anybody help me !!!!.
Thanks,
Srinivas

In processFormRequest write the below code
if("addRows".equals(eventName) && "<AdvancedTabldID>".equals(pageContext.getParameter("source"))){
am.invokeMethod("populateValues");
In AMImpl write the below code:
public void populateValues(){
XyzVOImpl vo = getXyzVO();
XyzVORowImpl row = (XyzVORowImpl ) vo.first();
while ( row != null )
if( identify the new ly added row here using some unique id or someother condition etc..)
row.setFieldxyzvalue("set the value here");
row = (XyzVORowImpl ) vo.next();
}

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