UI Behaviour Issue
So here’s the thing, I’m trying to figure out what behaviour the user would most likely expect when they click on a calendar cell that already has a value in it. Right now, it’s set to abort the creation of a new cell, since one already exists, but it could just as easily edit the existing cell.

So, in this screenshot, there’s already a cell at May 16. If the user double-clicks on May 16, or clicks the ‘Add Cell’ button on the toolbar, what should happen? Should they get a message that there’s already a cell there, or should it just drop into edit mode, putting the value of the cell in the Cell Value text field?
Stumble it!
