      *  Where <code>width</code> and <code>height</code> are properties
      *  of the target.
      * 
+     *  Implementations of this property must be Bindable and
+     *  they must generate events of type "propertyChange".
+     *   
      *  @default 0
      *  @see target
      *  @see verticalScrollPosition

    function get height():Number;
    
    /**
     * The positive extent of the content, relative to the 0,0
     * origin, along the X axis.
     */
    function get contentWidth():Number;
    
    /**
     * The positive extent of the content, relative to the 0,0 
     * origin, along the Y axis.
     */
    function get contentHeight():Number;


     *  Where <code>width</code> and <code>height</code> are properties
     *  of the target.
     * 
     *  Implementations of this property must be Bindable and
     *  they must generate events of type "propertyChange".
     *   
     *  @default 0
     *  @see horizontalScrollPosition
     */
