vbox_txt_area.append(self.txt_area, etk.VBox.START, etk.VBox.EXPAND_FILL, 0)
hbox_panel.append(vbox_txt_area, etk.HBox.START, etk.HBox.EXPAND_FILL, 0)
vbox_txt_area.append(self.txt_area, etk.VBox.START, etk.VBox.EXPAND_FILL, 0)
hbox_panel.append(vbox_txt_area, etk.HBox.START, etk.HBox.EXPAND_FILL, 0)