Tweening Blurs

How do you gradually add a filter? Can you do it using Tweener? I cant get her working…

[AS]var blur:BlurFilter = new BlurFilter();
blur.quality = BitmapFilterQuality.MEDIUM;
blur.blurX = 0;
blur.blurY = 0;
frontImage.filters = [blur];

Tweener.addTween (frontImage, { time:1, blurX:25, blurY:25, transition:“easeInQuad”} );

or

Tweener.addTween (blur, { time:1, blurX:25, blurY:25, transition:“easeInQuad”} );[/AS]