As seen in this example:

#include <QtGui>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QLabel* lbl = new QLabel("This is a really long string that has it's last letter cut");

QWidget* cntr = new QWidget();
QGridLayout* cntrGrid = new QGridLayout(cntr);
cntrGrid->addWidget(lbl, 0,0);

QTabWidget* viewOptions = new QTabWidget();
viewOptions->addTab( cntr, "Sequence View" );

viewOptions->show();
return app.exec();
}