I have found post from users having similar problems displaying a form from another form/class when they used the designer. It seems easier to do this straight from code like the textEditor demo. However, I have designed an app in the designer as well as an about box and I would like to use them.

The problem is that since I can't change the header created by the designer, how do I create a custom slot that the button click action will call without modifying the generated header file?