@fcarney Thanks a million. That was the problem.
And thanks for the advice.

@jsulm That came to my mind too but considering that all the other parts of Ui work - push buttons, tool buttons, all the actions associated with tool buttons and menu, two table views with sql table models, status bar displays status tips on hover over elements... I had to ditch that idea.

@awawawa

Hi.

Try in your test.h as follows:

#ifndef TEST_H #define TEST_H #include <QtCharts> QT_CHARTS_USE_NAMESPACE #include <QMainWindow> #include "ui_test.h" class test : public QMainWindow { [...]

Do not modify your ui_test.h.

Hi @Paul-Colby,

Awesome!
Now, I understand better what the Qt document wanted to say about this function.
(Probably, an example in the doc would be useful.)

It's a different question, but is there any way to move the xmlns attribute outside from this tag?
(Example, If I would use more <fooelement> tags, it would be redundant to see this definition again.)

Thanks a lot!