add a derived class to a qtdesigner project

[franco.amato]

Hi to all, I'm developing a track list (audio track) using designer. It's derived from QDialog that I'll execute from my main app.
I have some problems with drag and drop. In the project I added a QListWidget object to show the list of the tracks.
I would drag and drop from the dialog to my application. I think I should derive a class from QListWidget ( as in the puzzle example )?
But then I'm unable to add it to the ui file in the designer.
How can I do it?

Regards,
Franco

[Coises]

I think I should derive a class from QListWidget ( as in the puzzle example )?
But then I'm unable to add it to the ui file in the designer.
How can I do it?

Using Custom Widgets with Qt Designer explains how to promote a widget to a subclass in Qt Designer.