I really dislike having to remove my upper door panels. The fir trees are pain. Every time I remove them, one of fir trees is inevitably ripped out of the panel. So I was thinking, what if you glue magnets to the door panel around were the fir trees use to be and use them to keep the panels on. A magnet should adhere to the black metal bracket the fir trees stick into. Here is some magnets I found on eBay. There pretty much have the same diameter as a fir tree. The three millimeters of thickness should be enough to make contact.
http://cgi.ebay.com/10-Pcs-Neodymium...item415b7d17ff
Has anybody else done this? This would literally turn the job of removing the upper door panel into a 2 second task.