facing a trouble on QFileDialog

[Askar]

Dear Friends,
I want to reduce the size of QFileDialog , i tried using setFixedsize(x,y) function but the dialog size is not changing. the code is given below.

QFileDialog *file = new QFileDialog;
                        file->setFixedSize(320,240);
                        const QString fileName = file->getOpenFileName(this, Open File"),currentPath());

QFileDialog *file = new QFileDialog;
                        file->setFixedSize(320,240);
                        const QString fileName = file->getOpenFileName(this, Open File"),currentPath());

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thanks

Regards Askar