QWidget* TankInfoDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	// ncreate editor needs to be called before because it will populate a few
	// things in the currCombo global var.
	QWidget *delegate = ComboBoxDelegate::createEditor(parent, option, index);
	CylindersModel *mymodel = qobject_cast<CylindersModel *>(currCombo.model);
	cylinder_t *cyl = mymodel->cylinderAt(index);
	currCylinderData.type = cyl->type.description;
	currCylinderData.pressure = cyl->type.workingpressure.mbar;
	currCylinderData.size = cyl->type.size.mliter;
	return delegate;
}