Because it seems Microsoft is catching up (perhaps bypassing Flex at this point) on Silverlight's design capabilities via a little Catalyst-like tool called Expression Blend. I mean look at this below - look at the state flow diagram, that'd be nice for us to have, wouldn't it? Hurry up and steal this stuff!
Another thought about the state flow chart as I call it, it would be great to not show every feasible link or interaction between all states. My project contains about 30 different states. Not all states are linked to each other but Catalyst creates a list of every possible state link in the lower left. I might only use %5 of the possible link states. Not sure if this is using up space or something.