How 'bout them Actions

[CharlieHess]

Say I want a selectChannel action that happens down in a ChannelViewModel. I want that to bubble up to its parent ChannelListViewModel:

1. If I declare the action in ChannelListViewModel I can wire its result up to a property right there, but there's not a good way for the ChannelViewModel to invoke the action with some information.
2. If I declare the action in ChannelViewModel and try to do toProperty(parentViewModel, 'selectedChannel'), it doesn't work with a when selector. I think because the parent hasn't defined the property yet.