/**
  * @param selection a splittable which this function assumes is a list of {@link SelectionItem}s
  */
 public void setSelection(Splittable selection) {
   selectionItemsEditor.setSuppressEvent(true);
   AppTemplateAutoBeanFactory factory = GWT.create(AppTemplateAutoBeanFactory.class);
   SelectionItemList siList =
       AutoBeanCodex.decode(
               factory,
               SelectionItemList.class,
               "{\"selectionItems\": " + selection.getPayload() + "}")
           .as();
   List<SelectionItem> items = siList.getSelectionItems();
   tree.setSelection(items);
   selectionItemsEditor.setSuppressEvent(false);
 }
 @Override
 public void setValue(Argument value) {
   if ((value == null) || !value.getType().equals(ArgumentType.TreeSelection)) {
     return;
   }
   List<SelectionItem> toBeRemoved =
       AutoBeanUtils.getAutoBean(value).getTag(SelectionItem.TO_BE_REMOVED);
   if (toBeRemoved != null) {
     selectionItemsEditor.setSuppressEvent(true);
     for (SelectionItem si : toBeRemoved) {
       tree.getStore().remove(si);
     }
     selectionItemsEditor.setSuppressEvent(false);
   }
   AutoBeanUtils.getAutoBean(value).setTag(SelectionItem.TO_BE_REMOVED, null);
   this.model = value;
   boolean restoreSelectionsFromDefaultValue =
       (value.getDefaultValue() != null)
           && (value.getDefaultValue().isIndexed())
           && (value.getDefaultValue().size() > 0);
   tree.setRestoreCheckedSelectionFromTree(!restoreSelectionsFromDefaultValue);
   selectionItemsEditor.setValue(value.getSelectionItems());
   if (restoreSelectionsFromDefaultValue) {
     /*
      * JDS If we're not in editing mode, and there is a list of items in the defaultValue field.
      * This should only happen when an app is being re-launched from the Analysis window, and
      * there were values selected for the Tree.
      */
     Splittable defValCopy = value.getDefaultValue().deepCopy();
     setSelection(defValCopy);
     /*
      * JDS Clear default value so future selections can be made (since they are made through
      * value.getSelectionItems() and not value.defaultValue()
      */
     value.setDefaultValue(null);
   }
 }