List of upgrades

Supercell should add a tab in the shopping menu to view your towers and so on and have it's upgrade price there, versus clicking every building trying to find the one you can afford to upgrade, and then from there you can organize either by price, or by relativity, example put all defensive towers in one group, walls and traps in another, and resources in it's own as well. I find it frustrating having 1,000,000 elixer add up and forget what I was saving for, or can't find something upgradeable.