Is MathML workable in Qwt?

Created very simple MathML formula with this editor, inserted it into my code:

Code:

---

logitLabel->setPlainText(logitFormula(1, 2, 3, 4));
 
QString SetupPanel::logitFormula(double arg1, double arg2, double arg3, double arg4) const
{
  QString formula = QString(
    "<math><mn>%1</mn><mo>+</mo><mfrac><mn>%2</mn><mrow><mn>1</mn><mo>+</mo>"
    "<msup><mi>e</mi><mrow><mn>%3</mn><mo>&#x000B7;</mo><mi>X</mi><mo>+</mo>"
    "<mn>%4</mn></mrow></msup></mrow></mfrac></math>")
    .arg(QString::number(arg1))
    .arg(QString::number(arg2))
    .arg(QString::number(arg3))
    .arg(QString::number(arg4));
 
  return formula;
}

---

However formula looks strange in application:
Attachment 11959

That is how it looks in editor:
Attachment 11960

What is wrong here: MathML implementation in Qwt, formula editor, need to simplify formula or what? Is MathML ready for production here or need to search for other possibilities to render formulas?

Some solution could be found here: http://www.qtcentre.org/threads/5429...ath-expression

Hope Qwt author will see the problem and able to add necessary patches to official sources repository.