     [Inspectable(category="General", defaultValue="NaN")]
 
     /**
-     * The starting scale factor in the z direction.
+     *  The starting scale factor in the z direction.
+     *  A scale value of 0.0 is invalid.
+     * 
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     public var scaleZFrom:Number;
 

    [Inspectable(category="General", defaultValue="NaN")]

    /**
     * The ending scale factor in the z direction.
     */
    public var scaleZTo:Number;
            

import spark.effects.supportClasses.AnimateTransformInstance;

/**
 *  The Scale3D class scales a target object
 *  in three dimensions around the transform center.
 *  A scale of 2.0 means the object has been magnified by a factor of 2, 
 *  and a scale of 0.5 means the object has been reduced by a factor of 2.
 *  A scale value of 0.0 is invalid.
 * 
 *  <p>Like all AnimateTransform-based effects, this effect only works on subclasses
 *  of UIComponent and GraphicElement, as these effects depend on specific
 *  transform functions in those classes. 
 *  Also, transform effects running in parallel on the same target run as a single
 *  effect instance
 *  Therefore, the transform effects share the transform center 
 *  set by any of the contributing effects.</p>
 *  
 *  @mxml
 *
 *  <p>The <code>&lt;mx:Scale3D&gt;</code> tag
 *  inherits all of the tag attributes of its superclass,
 *  and adds the following tag attributes:</p>
 *
 *  <pre>
 *  &lt;mx:Scale3D
 *    <b>Properties</b>
 *    id="ID"
 *    scaleZBy="no default"
 *    scaleZFrom="no default"
 *    scaleZTo="no default"
 *  /&gt;
 *  </pre>
 *
 *  @langversion 3.0
 *  @playerversion Flash 10
 *  @playerversion AIR 1.5
 *  @productversion Flex 4
 */   
public class Scale3D extends Scale
{
    include "../core/Version.as";

    /**
     *  Constructor.
     *
     *  @param target The Object to animate with this effect.
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    public function Scale3D(target:Object=null)
    {
        super(target);
