      *  Static constant representing no proposed selection.
      */
     private static const NO_PROPOSED_SELECTION:int = -1;
+    
+    /**
+     *  @private
+     *  The animation duration used when hiding and showing the action bar.
+     */ 
+    private static const TAB_BAR_ANIMATION_DURATION:Number = 250;
     
     //--------------------------------------------------------------------------
     //

        if (selectedIndexChanged || dataProviderChanged)
        {
            var navigator:ViewNavigatorBase;

            // If the data provider has changed, the navigator elements have
            // already been removed, so the following code doesn't need to run
            if (!selectedIndexAdjusted && !dataProviderChanged && _selectedIndex >= 0)

        contentGroup.cacheAsBitmap = true;  
        
        finalEffect.addChild(animate);
        finalEffect.duration = TAB_BAR_ANIMATION_DURATION;
        return finalEffect;
    }
    
    /**
