I use the designer for simple dialogs only.
The feature I would really need is being able to put a _subclassed_ widget onto the form. If there is already such a functionality, I don't know how to use it... What I can do is to use the Qt provided widgets only, but usually I'd like to work with eg. MyTabWidget instead of QTabWidget. I'd welcome Visual Studio's convenient solution in the designer for this issue.
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