     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
      *  

    private var _popUpWidthMatchesAnchorWidth:Boolean = false;
    
    /**
     *  If true, the popUp's width is set to the value of the PopUpAnchor's width.
     * 
     *  @default false
     *  

    [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
