QtCore.QObject.connect(self.action_DeleteArticle, QtCore.SIGNAL("triggered()"), MainWindow.onArticleDelete)
QtCore.QObject.connect(self.categories, QtCore.SIGNAL("itemActivated(QTreeWidgetItem*,int)"), MainWindow.onCategoryItemActivated)
QtCore.QObject.connect(self.articles, QtCore.SIGNAL("itemActivated(QTreeWidgetItem*,int)"), MainWindow.onArticleItemActivated)
QtCore.QObject.connect(self.action_DeleteArticle, QtCore.SIGNAL("triggered()"), MainWindow.onArticleDelete)
QtCore.QObject.connect(self.categories, QtCore.SIGNAL("itemActivated(QTreeWidgetItem*,int)"), MainWindow.onCategoryItemActivated)
QtCore.QObject.connect(self.articles, QtCore.SIGNAL("itemActivated(QTreeWidgetItem*,int)"), MainWindow.onArticleItemActivated)