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//! [0] //! [1]
        treeView =  QTreeView()
//! [0]
        model =  MyItemModel(self)

        treeView.setModel(model)
//! [1]

//! [2]
        sourceModel =  MyItemModel(self)
        proxyModel =  QSortFilterProxyModel(self)

        proxyModel.setSourceModel(sourceModel)
        treeView.setModel(proxyModel)
//! [2]

//! [3]
        treeView.setSortingEnabled(True)
//! [3]

//! [4]
        proxyModel.sort(2, Qt.AscendingOrder)
//! [4] //! [5]
        proxyModel.setFilterRegExp(QRegExp(".png", Qt.CaseInsensitive,
                                            QRegExp.FixedString))
        proxyModel.setFilterKeyColumn(1)
//! [5]