connect(editButton, SIGNAL(clicked()), this, SLOT(editButtonClicked()));
connect(addButton, SIGNAL(clicked()), this, SLOT(addButtonClicked()));
connect(deleteButton, SIGNAL(clicked()), this, SLOT(deleteButtonClicked()));
connect(editButton, SIGNAL(clicked()), this, SLOT(editButtonClicked()));
connect(addButton, SIGNAL(clicked()), this, SLOT(addButtonClicked()));
connect(deleteButton, SIGNAL(clicked()), this, SLOT(deleteButtonClicked()));