CheckGroup and ListView

[Mohammad Salman]

I use a ListView to populate a CheckGroup with Check objects.  It works fine 
and all the check boxes are displayed properly.  But when I try to add a new 
check box to the ones previously added, I keep getting the new one along with 
the previous ones in duplicate.

Here is my code. (I apologize for the format of the code)


protected void addCheckGroup(
List<SelectableValue> list)
throws Exception
{
Object object = getDefaultModelObject();
checkGroupSelectableValues = new CheckGroup<SelectableValue>("selectedValues");
//checkGroupSelectableValues.add(new CheckGroupSelectors("groupSelector"));
selectableValues = new ListView<SelectableValue>("selections", list)
{

            /**
             * 
             */
            private static final long serialVersionUID = 1L;

@Override
            protected void populateItem(
                ListItem<SelectableValue> item)
            {
            item.add(new Check<SelectableValue>("check", item.getModel()));
            item.add(new Label("value", new 
PropertyModel<SelectableValue>(item.getModel(), "value")));            
            }
};
checkGroupSelectableValues.add(selectableValues);
selectableValues.setOutputMarkupPlaceholderTag(true);
checkGroupSelectableValues.setRenderBodyOnly(false);
checkGroupSelectableValues.setOutputMarkupPlaceholderTag(true);

add(checkGroupSelectableValues);
}





protected void addNewSelectableValue(
AjaxRequestTarget target)
throws Exception
{
List<SelectableValue> list;  // new list with the new SelectableValue added 
selectableValues.removeAll();   // making sure to remove previous object
selectableValues.setList(list);   // Adding the new list to the ListView
checkGroupSelectableValues.removeAll();  // making sure to remove previous 
check boxes.
checkGroupSelectableValues.add(selectableValues);

target.addComponent(checkGroupSelectableValues);
     }

I have tried different other methods but  either I get the previous values in 
duplicates or the new value does not show up.

I will appreciate help in solving this issue.  Thanks

 Mohammad