QMessageBox disabled the close button when you setStandardButtons(NoButton)!

I have a QMessageBox, when I did the

Code:

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QMessageBox myBox = new QMessageBox();
myBox.setStandardButtons(NoButton);
myBox.exec();

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the dialog's close button(on the upright corner of the dialog) will turn to be disable.
How to enable the close button?

Play with window flags.

Use:->

Code:

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myBox.setStandardButtons(QMessageBox::Close);

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If you dont want anything on the widget then simply define one QWidget with empty widgets.