      *  <p>The mask type. Possible values are <code>MaskType.CLIP</code>, <code>MaskType.ALPHA</code> 
      *  or <code>MaskType.LUMINOSITY</code>.</p> 
      *
-     *  <p>Clip Masking</p>
+     *  <p><b>Clip Masking</b></p>
      * 
      *  <p>When masking in clip mode, a clipping masks is reduced to 1-bit.  This means that a mask will 
      *  not affect the opacity of a pixel in the source content; it either leaves the value unmodified, 
      *  if the corresponding pixel in the mask is has a non-zero alpha value, or makes it fully 
      *  transparent, if the mask pixel value has an alpha value of zero.</p>
      * 
-     *  <p>Alpha Masking</p>
+     *  <p><b>Alpha Masking</b></p>
      * 
      *  <p>In alpha mode, the opacity of each pixel in the source content is multiplied by the opacity 
      *  of the corresponding region of the mask.  i.e., a pixel in the source content with an opacity of 
      *  1 that is masked by a region of opacity of .5 will have a resulting opacity of .5.  A source pixel 
      *  with an opacity of .8 masked by a region with opacity of .5 will have a resulting opacity of .4.</p>
      * 
-     *  <p>Luminosity Masking</p>
+     *  <p><b>Luminosity Masking</b></p>
      * 
      *  <p>A luminosity mask, sometimes called a 'soft mask', works very similarly to an alpha mask
      *  except that both the opacity and RGB color value of a pixel in the source content is multiplied


/**
 *  The alpha of the content background for this component.
 * 
 *  @langversion 3.0
 *  @playerversion Flash 10

     * 
     *  @default spark.layouts.BasicLayout
     *
     *  @see spark.layouts.supportClasses.LayoutBase
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
