JSF-2 Select/Unselect all the list of checkboxes with single checkbox

I have list of check boxes inside rich:dataTable and I want to check all the boxes at once with a single check box from header column.

Also, there is pagination for data table. Pagination is active when there are more than 10 rows of data. Each page contains 10 rows of data. So, If I go to the next page the previous checked boxes have to be checked if I go back to previous page.

<rich:column id="includeInWHMapping" >
      <f:facet name="header">
        <h:selectBooleanCheckbox value="#{checkallbox.selectAll}">
           <f:ajax actionListener="#{checkallbox.selectAllBox}" render="selectedForWHProcess" />
        </h:selectBooleanCheckbox>  
      </f:facet>        
      <h:selectBooleanCheckbox id="selectedForWHProcess" value="#{checkallbox.checked[data]}">      
         <f:ajax actionListener="#{checkallbox.selectAllRows}"/>
      </h:selectBooleanCheckbox></rich:column>

Code in checkallbox Bean:

private Map<StandardStructure, Boolean> checked = new HashMap<StandardStructure, Boolean>();        
private boolean selectAll;

public boolean isSelectAll() {
    return selectAll;
}

public void setSelectAll(boolean selectAll) {
    this.selectAll = selectAll;
}

public Map<StandardStructure, Boolean> getChecked() {
    return checked;
}

public void setChecked(Map<StandardStructure, Boolean> checked) {
    this.checked = checked;
}

public void selectAllBox(ValueChangeEvent e){
    boolean newSelectAll = (Boolean) e.getNewValue();
    Iterator<StandardStructure> keys = checked.keySet().iterator();
    while(keys.hasNext()){
        StandardStructure ss = keys.next();
        checked.put(ss, newSelectAll);
    }
}

When I check the h:selectBooleanCheckBox of header column nothing happens. What am I missing here? Should I have to implement Map for "selectAll" property too?

Thanks.