How Shall I programatically set VO's for Advanced Table?

Question

I have Advanced Table which display data from 3 different table under certain conditions.
These 3 tables having same columns but different data.
Here I have defined 3 VOs for this 3 tables.
Now I want to programatically configure this VO to Advanced Table.
Also...How shall i set View Attribute for Column in Advanced Table.
I have written following code..but that didnt work...it is in processRequest()
OAAdvancedTableBean tableBean = (OAAdvancedTableBean) webBean.findChildRecursive("SampleTable");
if (tableBean!=null)
System.out.println("Table Bean is Not Null");
tableBean.prepareForRendering(pageContext);
tableBean.setViewUsageName("EMCOpptyLevel1DataVO"); //EMCOpptyLevel1DataVO is name of VO
OAMessageTextInputBean hours = (OAMessageTextInputBean)tableBean.findIndexedChildRecursive("hours1");
hours.setViewUsageName("EMCOpptyLevel1DataVO");
hours.setViewAttributeName("Hours");
am.invokeMethod("initialize");// This will execute query on EMCOpptyLevel1DataVO
}

Answer 1

We have done it in the follwoing way. I have created one VO and this was with qry "select a,b from tab1;"
I have written an public initialize(int condition){} method in VOImpl class. In the initialize method I used to change the qry of the VO something like this
public initialize(int condition){
if condition = 1
     setqry("select a,b from tab1");
     setFullSqlMode(FULLSQL_MODE_AUGMENTATION);
if condition = 2
     setqry("select a,b from tab2");
     setFullSqlMode(FULLSQL_MODE_AUGMENTATION);
Basically, I was using only one VO, but changing the qry on the VO dynamically depending on the condition. Depending on the condition I initialize my VO appropriately.