We should behave like the DateEdit widget.
make it fix released as we don't have any release anyway
I think choosing the date should also close the widget. And focusing the date field should open it, not only the button on the right.
If you double-click on a date, the widget will be closed. I know that it's not ideal but it's how the Gtk calendar widget works. Anyway, it should be opened in another bug, this one is not related (and very old)
Bug watches keep track of this bug in other bug trackers.
make it fix released as we don't have any release anyway