code: public static String getTypeAsString(final WDropdown.DropdownType type) {
  		if (type == null) {
  			return null;
  		}
  
  		switch (type) {
  			case NATIVE:
  				return null;
  			case COMBO:
  				return "combo";
  			default:
  				throw new IllegalStateException("Invalid dropdown type: " + type);
  		}
  	}
docs: Determines the theme tabset type name for the given TabSetType.
  
  @param type the TabSetType
  @return the theme tabset type name for the given TabSetType.