Call MainWindow through QDialog

[sousadaniel7]

My bad, need to read the error to the end next time
Drop the () from Inicio.

Inicio d;
if(d.exec())
...

Inicio d;
if(d.exec())
...

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This works, but now I when I click a button from QDialog closes the application.
And instead of closing the application you want to open the MainWindow.

How do I make it?