this.selectionTabMenuItem = new SelectionTabMenuItem(tree, this.parameter.userInterface);
// check input parameter
if(tree == null) return;
// create items
this.menuItems.add(this.openVerticesMenuItem);
this.menuItems.add(new OpenSubGraphMenuItem(tree, this.parameter.model, this.parameter.userInterface));
this.menuItems.add(this.selectionTabMenuItem);
// add mouse listener to jTree
this.tree.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
mouseReleased(e);