def sizeHint(self, option, index):
        box = QtGui.QStyleOptionButton()
        style = QtGui.QApplication.instance().style()
        return style.sizeFromContents(QtGui.QStyle.CT_CheckBox, box,
                                      QtCore.QSize(), None)
Generates a list of relevant order properties from the query.
dataset/ETHPy150Open enthought/traitsui/traitsui/qt4/extra/checkbox_renderer.py/CheckboxRenderer.sizeHint--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/datastore/appscale_stub_util.py/order_property_names