code: private boolean isSelectable(final MenuItem item, final SelectionMode selectionMode) {
  
  		if (!(item instanceof MenuItemSelectable) || !item.isVisible()
  				|| (item instanceof Disableable && ((Disableable) item).isDisabled())) {
  			return false;
  		}
  
  		// SubMenus are only selectable in a column menu type
  		if (item instanceof WSubMenu && !MenuType.COLUMN.equals(getType())) {
  			return false;
  		}
  
  		// Item is specificially set to selectable/unselectable
  		Boolean itemSelectable = ((MenuItemSelectable) item).getSelectability();
  		if (itemSelectable != null) {
  			return itemSelectable;
  		}
  
  		// Container has selection turned on
  		return SelectionMode.SINGLE.equals(selectionMode) || SelectionMode.MULTIPLE.equals(selectionMode);
  
  	}
docs: Indicates whether the given menu item is selectable.
  
  @param item the menu item to check.
  @param selectionMode the select mode of the current menu/sub-menu
  @return true if the meu item is selectable, false otherwise.