     
     private var _source:Object;
     
+    [Bindable("sourceChanged")]
     [Inspectable(category="General")]
     
     /**

    {        
        if (value != _source)
        {
            _source = value;
            sourceInvalid = true;
            invalidateProperties();
        }
    }
    

        else
        {
            // Return estimated width/height here as we've yet to fully
            // realize valid image content. If we are loading new content
            // we keep the old measured width/height, otherwise we fall back
            // to 0 unless a preliminary width/height is set. This is to avoid
            // sizing to 0,0 for a frame unnecessarily.
            var previousWidth:Number = (_source == null || _source == "") ? 0 : measuredWidth;
            var previousHeight:Number = (_source == null || _source == "") ? 0 : measuredHeight;
            measuredWidth = !isNaN(_preliminaryWidth) && (measuredWidth == 0) ? 
                _preliminaryWidth : previousWidth;
            measuredHeight = !isNaN(_preliminaryHeight) && (measuredHeight == 0) ? 
                _preliminaryHeight : previousHeight;
            return;
        }
        
