QWtPlot: Workaround for insertLegend bug?

[darkshu]

Could someone post me solution for such bug?

QwtLegend *legend = new QwtLegend();
  qwtPlot->insertLegend(legend, QwtPlot::RightLegend);

QwtLegend *legend = new QwtLegend();
  qwtPlot->insertLegend(legend, QwtPlot::RightLegend);

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this is only difference between good / bad look.
Code is simple - new Plot
insert legend
other things arn't important ( bug still exist with commented rest of code )
qwt: 5.2.1
qt 4.5
compiler: vc2008