connect(widthED, SIGNAL(textChanged(QString)),
this, SLOT(change_adaptor()));
connect(widthUnitLC, SIGNAL(selectionChanged(lyx::Length::UNIT)),
this, SLOT(change_adaptor()));
connect(widthED, SIGNAL(textChanged(QString)),
this, SLOT(change_adaptor()));
connect(widthUnitLC, SIGNAL(selectionChanged(lyx::Length::UNIT)),
this, SLOT(change_adaptor()));