relative positioning and font sizing in flex

I need to position an object in the bottom half of a container (working on flex 4)- abt 25% above the bottom...and cant use x,y coordinates given need for resizing. I have been able to position the layout containers and they work well

Also need fonts to resize as the buttons get smaller

A开发者_开发技巧ppreciate your guidance in advance

http://pastebin.com/7VivyqH5