Implementing GUI through pure code (starling)

Ok, so here it is. I’ve just started using the starling framework(my project is currently in graphic dev :P) anyway, since I can link movieclips from flash pro to my as3 classes I’m now forced to use sprite sheets(I understand what they are) so when I’m making my menus by using code I’m going to have to type down the exact x and y locations of the buttons. Is there an easier method than going back and forth from my design window copying the x and y cord and pasting them into my code? Is there a program out there that you can make a layout of buttons for a GUI and export a XML file that has the button subtexture reference and its x and y cord in the game screen?
So you have a sprite sheet of buttons(they would be different sizes :/) you upload it to the program and you export a XML file.

if that doesn’t exist maybe you could give me tips on how you store all your information for you game interfaces.

thanks