Dynamically generated controls based on data from dictionary

I have attempted the GUI controls creation in a prompt based on data from dictionary. Is this the best way of implementing this?

import sys
from PyQt4 import QtCore, QtGui


class MessageBox(QtGui.QDialog):
    """docstring for MessageBox"""
    def __init__(self, data=None, parent=None):
        super(MessageBox, self).__init__(parent)
        self._data = data
        self.buildUi()

    def buildUi(self):
        self.gridLayout = QtGui.QGridLayout()
        self.gridLayout.setSpacing(10)
        for index, (key, values) in enumerate(self._data.iteritems()):
            getLbl = QtGui.QLabel("Get", self)
            label = QtGui.QLabel(key, self)
            chkBox = QtGui.QCheckBox(self._data[key][0], self)
            chkBox.setToolTip("Click here to get the book")
            version = QtGui.QSpinBox( self)
            version.setValue(self._data[key][-1])
            version.setRange(self._data[key][-1], 12)
            self.gridLayout.addWidget(getLbl, index, 0)
            self.gridLayout.addWidget(label, index, 1)
            self.gridLayout.addWidget(chkBox, index, 2)
            self.gridLayout.addWidget(version, index, 3)
        self.layout = QtGui.QVBoxLayout()
        self.okBtn = QtGui.QPushButton("OK")
        self.layout.addLayout(self.gridLayout)
        self.horLayout = QtGui.QHBoxLayout()
        self.horLayout.addStretch(1)
        self.horLayout.addWidget(self.okBtn)
        self.layout.addLayout(self.horLayout)
        self.setLayout(self.layout)


class MainWindow(QtGui.QMainWindow):
    """docstring for MainWindow"""
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        # self.widget = FormWidget()
        self._data = {
                'Contact':['Carl Sagan', 2],
                'End of Faith':['Sam Harris', 7],
                'On Mars':['Patrick Moore', 1],

                }
        self.btn = QtGui.QPushButton("Hello", self)
        self.btn.clicked.connect(self._launchMessageBox)

        self.show()

    def _launchMessageBox(self):
        dlg = MessageBox(self._data)
        dlg.exec_()


def main():
    app = QtGui.QApplication(sys.argv)
    window =  MainWindow()
    window.show()
    # window.raise_()
    sys.exit(app.exec_())




if __name__ == '__main__':
    main()