tagLayout.addLayout(closeTagLayout);
QHBoxLayout linkedNotebookLayout = new QHBoxLayout();
linkedNotebookLayout.addLayout(openLinkedNotebookLayout);
linkedNotebookLayout.addLayout(middleLinkedNotebookLayout);
linkedNotebookLayout.addLayout(closeLinkedNotebookLayout);
QVBoxLayout mainLayout = new QVBoxLayout();
mainLayout.addLayout(upperLayout);
mainLayout.addLayout(tagLayout);
mainLayout.addLayout(linkedNotebookLayout);