How to chage QDailog border???

[sudhansu]

Hi All,
I've a QDialog and its frame less. i need the border of that dialog to be thick gray color.
If i do like

this->setStylesheet("border :  5px solid gray");

this->setStylesheet("border :  5px solid gray");

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its affecting other editboxs border, which are added to this Qdialog. but no affect to QDialog border. Any suggestion??

Thank you all.