Any news on this? I've recently updated a project from v3 to v4 and a Custom Widget has stopped working. I'm going through the problems one-by-one and fixing but an example compatible with version 4 would be very useful to speed things up. A 3 to 4 Widget Upgrade guide would be even better!
You're completely right, they should be updated, it has now been added to the todo list. We ask for your patience as we are also very busy working on the Mendix 5 release though.