PyQt: How to manipulate QFileDialog

[xaverxn]

Actually, might it be a problem that the QLayout object was created by C(++)? Wouldn't that mean any manipulation is impossible?
Because if I translate this: http://developer.qt.nokia.com/faq/an...ialog_instance line-by-line, it's not working either:

import sys
from PyQt4 import QtCore,QtGui
 
app = QtGui.QApplication(sys.argv)
box = QtGui.QFileDialog()
button = QtGui.QPushButton(box)
button.setText("New button")
layout = box.layout()
layout.addWidget(button, 0, 0)
box.show()
sys.exit(app.exec_())

import sys
from PyQt4 import QtCore,QtGui

app = QtGui.QApplication(sys.argv)
box = QtGui.QFileDialog()
button = QtGui.QPushButton(box)
button.setText("New button")
layout = box.layout()
layout.addWidget(button, 0, 0)
box.show()
sys.exit(app.exec_())

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(Actually, is line 8 correct? I don't speak C++)

Regards, Xaver