Hi, I have the same problem with WPF. Can you pinpoint me to the solution?
EDIT: Nvm, just noticed it works for WPF too.
Although this prevents the error from happening, the problem is not completely gone away. If I set the MaxWidth to 500 and the container's current width is 200, when the line to show where the item is going to drop, it makes the container expand to its max width, which is a really weird behavior to just overlook it. Is there a solution for this as well?