Problem in alignment of cell content in Advanced Table

Hi,
I have a column which has some flag say 'Y' or 'N'.
I have created an advanced table and followed the dev guide for aligning the value in the center of the cell.But i m getting null pointer exception when I m using getColumnFormats method of advanced table.
OAAdvancedTableBean resultsTableBean =(OAAdvancedTableBean)webBean.findChildRecursive("region2");
System.out.println("index"+pageContext.findChildIndex(resultsTableBean,"column1"));
OAColumnBean manuPartNoCol =(OAColumnBean)webBean.findChildRecursive("column1");
manuPartNoCol.setAttributeValue(ALIGNMENT_GROUP_ATTR,ICON_BUTTON_FORMAT);
resultsTableBean.prepareForRendering(pageContext);
// now get a handle on the array of Column Format Dictionaries
DataObjectList myColumnFormats = resultsTableBean.getColumnFormats();
System.out.println("myColumnFormats.getLength"+myColumnFormats.getLength());
// get a handle on the specific Column Format Dictionary you
// are interested in
oracle.cabo.ui.data.DictionaryData myIconColumnFormat = (oracle.cabo.ui.data.DictionaryData)
myColumnFormats.getItem(pageContext.findChildIndex(resultsTableBean,"column1"));
// set the CELL_NO_WRAP_FORMAT_KEY property to TRUE
myIconColumnFormat.put(COLUMN_DATA_FORMAT_KEY , ICON_BUTTON_FORMAT);
BUt if I use table bean instead of advanced table bean then the same code works.
Basically i have to set the alignment of the cells in the advanced table bean in the runtime.
Can anybody suggest something?
Thanks

Provide the error stack.
--Shiv

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