layout->addWidget(button = new QPushButton(tr("Evaluate")), 1, 1);
connect(button, SIGNAL(released()), this, SLOT(doEvaluate()));
connect(line, SIGNAL(returnPressed()), this, SLOT(doEvaluate()));
layout->addWidget(button = new QPushButton(tr("Evaluate")), 1, 1);
connect(button, SIGNAL(released()), this, SLOT(doEvaluate()));
connect(line, SIGNAL(returnPressed()), this, SLOT(doEvaluate()));