 package spark.components
 {
+import flash.events.Event;
+
 import mx.core.IVisualElement;
 import mx.core.mx_internal;
 import mx.utils.BitFlagUtil;

                    CONTENT_PROPERTY_FLAG, value != null);
        }
        else
            contentGroupProperties[TITLE_GROUP_PROPERTIES_INDEX].content = value;
        
        invalidateSkinState();
    }
    
    //----------------------------------
    //  titleGroupLayout
    //---------------------------------- 
    
    /**

    /**
     *  @private
     */
    public function set titleLayout(value:LayoutBase):void
    {
        if (titleGroup)
        {
