How to get a value from a column inside a table

Hi,
I have got the following problem. I have got a table with some data inside. And a new column, which is not in the dataprovider. Now i search for an opportunity to go through the rows of the table and check the value of this column. I cant do this with the dataprovider or the rowset. My question is now how can i do this? The table object doesnt seem to have a corresponding method.
Thanks in advance for help
Acinonyx

this is some code you can use (based on Winston's and others' tips):
put this in you page bean:
private HashSet selectedRows = new HashSet();
public boolean isSelected() {
TableRowDataProvider trdp = (TableRowDataProvider)getBean("currentRow");
if (trdp == null) {
return false;
RowKey rowKey = trdp.getTableRow();
if (this.selectedRows.contains(rowKey.getRowId()))
return true;
else
return false;
public void setSelected(boolean b) {
TableRowDataProvider trdp = (TableRowDataProvider)getBean("currentRow");
RowKey rowKey = trdp.getTableRow();
if (checkbox1.isChecked()) {
this.selectedRows.add(rowKey.getRowId());
Object v = this.t_fotoDataProvider.getValue("fieldName", rowKey);
} else {
this.selectedRows.remove(rowKey.getRowId());
and then bind the "selected" property of the checkbox column to the "selected" property of the page bean.
Now, eveytime the page is submitted, you can do something useful, for example, in the setSelected() method (the row that starts with Object v = ... get's the value of some field corresponding to the checked row)
Mauro

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BEGIN
IF(pi_flag_codes IS NOT NULL) THEN
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