Some more usefull methods in ViewObjectImpl

1.getFilteredRows(java.lang.String attrName, java.lang.Object attrValue)

          Returns all rows in this collection whose attribute value matches the value being passed in attrValue.

 2.getRow(Key key)

          Returns the first row matching a given key.

 3.setCurrentRow(Row row)

          Designates a given row as the current row.
 getCurrentRow()
          Returns the current row of the iterator.

for more info

ViewObjectImpl API