[EMBED (source="????")] - using dynamic source?

Question

dynamic button skinning - I can't believe I've spent so long trying to do this..............
I have my spark Button loading an icon using the embed metadata tag:
[Embed(source=("icon1.png"))]
private var _icon:Class;
yay - that works!!!
However, I'm not entirely sure how to get the embed tag to recognise my file reference as a dynamic/concatenated string:
var myFilePath:String = imgPath+"icon"+varNum+".png";
[Embed(source=myFilePath)]
private var _icon:Class;
That doesn't work:
'myFilePath' does not have a recognized extension, and a mimeType was not provided IconButton.as /Copy of IconButtonDemo/src line 22 Flex Problem
Unable to transcode myFilePath. IconButton.as /Copy of IconButtonDemo/src line 22 Flex Problem
How does one go about creating that file reference for the embed tag to read properly???  I'm going to need it, so I can build the file path from dynamic data and looping, etc.
As always, thanks in advance... I'm learning alot from reading here today.

Answer 1

Ah.... so the EMBED tag is for compile time only... not runtime loading....
Despite this, I'd still like to know if it's possible to concatenate the embed source.
Also, is there also any way to get an asset into a button component dynamically at runtime?