How to use swf file for Spark Skin

Question

Hi all
I have little confuse about how to use swf file with Spark Skin,
in Flex3 , i use Flex Skin Design Extension for Flash to deal with skin ,
so basically , I just create a swf file and import to the project , then everything is ok
but , seem that not working in flex4 , spark skin.
1` I can't find the Flex Skin Design for the FlashCs4
2` I try to use FlashCs3 version to import the skin art to the project , but seemed not working.
3` I Google and check the Flex4 Help , seemed Spak skin need the Skin-Class , which I don't know how to use that with swf file
    what I have searched is how to use FXG , or some jpg file in that skin class, none of them are use swf file.
so , is there any way that let user use the swf file to deal with the skin?
       is the Flex Skin Design can use in Flex4?
Thanks

Answer 1

Hello,
I'm new to Flex, but have come to it from Flash Pro.  I'd like to know the same thing.  I think I found the answer here:
http://www.flashallys.com/blog/spark-button-skinning-with-flash-symbols/
However my question is now: Is this a good approach to use?
99% of the googling I've done tells me to skin components with fxg files.  I've tried that by creating graphics and exporting from flash, but using swfs containing lots of graphics is much faster so I'd rather use that.
The other thing I've done is to create custom components using these helpful tutorials:
Creating component in flash:
http://www.webkitchen.be/2008/12/12/video-tutorial-make-flex-components-with-flash-cs4/
Dealing with Resizing with method overrides for your flash component:
http://www.psyked.co.uk/flex/creating-flex-components-the-easy-way-for-flash-ide-converts. htm
This allows me the flexibility of Flash Pro design with the layout, transistions, data binding etc from Flex.
So my question is: Is this approach (skinning spark components with swfs, and using custom swc components made in flash) a bad idea for any reason?  E.g. does it create slow mobile apps?
Cheers
Chris