About the Column Groups

Question

hi, all ,i want to produce groups of columns, The header of a column group spans across all the columns it contains.
e.g.
             name
firstname     lastname            age  header "Name" contains two sub columns with headers "First" and "Last" ,This is no problem,but the table contains anthor column "age" , I can't let header "age" align Center,The following is my code
   <af:table rows="#{bindings.StudentVVO.rangeSize}"
                    emptyText="#{bindings.StudentVVO.viewable ? 'No rows yet.' : 'Access Denied.'}"
                    var="row" value="#{bindings.StudentVVO.collectionModel}"
                    selectionState="#{bindings.StudentVVO.collectionModel.selectedRow}"
                    selectionListener="#{bindings.StudentVVO.collectionModel.makeCurrent}"
                    >
           <af:column headerText="name">
              <af:column headerText="1">
                <af:outputText value="#{row.firstName}"/>
              </af:column>
              <af:column headerText="2">
                <af:outputText value="#{row.lastName}"/>
              </af:column>
            </af:column>
          <af:column headerText="age"
                     inlineStyle="height:150.0pt; text-align:center;" >
                 <div>   
                <af:outputText value="#{row.age}"/>
                </div>
              </af:column>
      </af:table>
         my JDeveloper version is 10.1.3.3 ,who can help me ,thanks very much!

Answer 1

Null Null ( nice to have name indeed)
Try this
Set the field displaying this value as vertically variable and horizontally fixed. And ensure that the length of the field is good enough to display 10 characters.
Good Luck
Vij