code: public void setItemIcon(String itemIcon)
      {
          String val = setNonEmptyValueAttribute(itemIcon);
          if (val != null)
              _iState.setItemIcon(setNonEmptyValueAttribute(val));
      }
docs: Sets the default icon for TreeElements for a blank area of the tree.
  (Defaults to "folder.gif").
  @param itemIcon the image name of the itemIcon
  @jsptagref.attributedescription Sets the default icon for TreeElements for a blank area of the tree.
  (Defaults to "folder.gif").
  @jsptagref.databindable false
  @jsptagref.attributesyntaxvalue <i>string_itemIcon</i>
  @netui:attribute required="false"  rtexprvalue="true"
  description="Sets the default icon for TreeElements for a blank area of the tree."