Mail: Add 'Mark Task as complete' in To Do bar
I recently discovered the To Do Bar, and I like it very much. But how can I mark a task as completed in the To Do Bar? I don't see a toggle box that I can click on (as in the Tasks view). The context menu gives me the option to Delete the task, but not to mark it as completed. Double-click allows me to edit the details of the task, but even in that window I don't see an easy way of marking the task as completed. I can manually edit the field "Date completed", but that's rather cumbersome.
Am I overlooking something or is this essential feature missing?