[Inspectable(category="General", enumeration="rows,columns", defaultValue="rows")]

    /**
     *  Specifies whether elements are arranged row by row or
     *  column by column.
     *  ActionScript values can be <code>TileOrientation.ROWS</code> and 
     *  <code>TileOrientation.COLUMNS</code>.
     *  MXML values can be <code>"rows"</code> and <code>"columns"</code>.
     *
     *  @default TileOrientation.ROWS
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    public function get orientation():String
    {
        return _orientation;
    }

[Inspectable] metada

flex enumeration

Flex

ActionScript 3