private void defineLowerPanel() { // add button JButton addButton = new JButton(ADD); addButton.addActionListener(control.getAddCatalogListener(this)); // edit button JButton editButton = new JButton(EDIT); editButton.addActionListener(control.getEditCatalogListener(this)); // delete button JButton deleteButton = new JButton(DELETE); deleteButton.addActionListener(control.getDeleteCatalogListener(this)); // back button JButton backButton = new JButton(BACK); backButton.addActionListener(control.getBackToMainListener(this)); // create lower panel JButton[] buttons = {addButton, editButton, deleteButton, backButton}; lowerSubpanel = GuiUtil.createStandardButtonPanel(buttons); }