Perhaps I will build my own template files then. I feel like there ought to be a vector design tool that makes it easy to just drop UI elements into a predefin

Perhaps I will build my own template files then. I feel like there ought to be a vector design tool that makes it easy to just drop UI elements into a predefined display space—preferably even dynamic elements. (And while I'm dreaming, one that makes documentation easy.) Either I'm missing it, or there just isn't an ideal tool for UI designers right now.