I've seen that textfield. But I have no idea how it works. They don't explain it in the docs. All they say is:

"Finally, you can specify the function used to load pixmaps into the form window (the Pixmap Function)."

That's not a lot to go on. What signature should it have? Where do I define it? What should it do?

And more to the point: This is hardly a Designer feature if I still have to type a function for it myself. I was more expecting a small popup-dialog from the property editor where I could specify the properties and pixmaps for the QIcon.

I already have a function that creates the QIcons and attaches them to the QActions. Why would I need the "pixmap function" feature for that?