A way to hide a specific view

[mergesort]

This would either entail external access to the messageBarQueue, or a facade, that lets you add tags of some sort to a TWMessageView, and be able to cancel a specific view.

There are times where I don't just want to show subsequent messages, but may want to cancel one.

@terryworona Do you have any thoughts, or ideas?

[terryworona]

Totally possible, but unlikely that it becomes a function in this library.

Trying to keep it simple for now....