     private var _popUpHeightMatchesAnchorHeight:Boolean = false;
     
     /**
-     *  If true, the popUp's height is set to the value of the PopUpAnchor's height.
+     *  If true, the height of the <code>popUp</code> control is set to the value of the PopUpAnchor's height.
      * 
      *  @default false
      *  

[DefaultProperty("popUp")]

/**
 *  This component is used to position a drop-down element,
 *  such as a DropDownList component, in layout. Because a drop-down 
 *  element is added to the display list by the PopUpManager, it doesn't normally 
 *  participate in layout. The PopUp component is a UIComponent that is added to a 
 *  container and is laid out. It is then responsible for sizing and 
 *  positioning the dropDown element relative to itself.
 *  
 *  @langversion 3.0
 *  @playerversion Flash 10
 *  @playerversion AIR 1.5

    [Bindable ("popUpChanged")]
    
    /**
     *  The IFlexDisplayObject to add to the PopUpManager when the PopUpAnchor is opened. 
     *  If the <code>popUp</code> control implements IFocusManagerContainer, the 
     *  <code>popUp</code> control will have its
     *  own FocusManager. If the user uses the Tab key to navigate between
     *  controls, only the controls in the <code>popUp</code> control are accessed. 
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
