Hello. I apologize for my English.
I have installed the library QWT 6.0.0 with Patch Multi Axes Support.
I displayed on the graph two curves, with two axes Y.
I connect an object of class Zoomer for each curve (as in Example Bode from Qwt).
Qt Code: 
  1. class Zoomer: public QwtPlotZoomer
  2. {
  3. public:
  4.     Zoomer(int xAxis, int yAxis, QwtPlotCanvas *canvas):
  5.         QwtPlotZoomer(xAxis, yAxis, canvas)
  6.     {
  7.         setTrackerMode(QwtPicker::AlwaysOff);
  8.         setRubberBand(QwtPicker::NoRubberBand);
  9.         setMousePattern(QwtEventPattern::MouseSelect2,
  10.             Qt::RightButton, Qt::ControlModifier);
  11.         setMousePattern(QwtEventPattern::MouseSelect3,
  12.             Qt::RightButton);
  13.     }
  14. };
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Qt Code: 
  1. int xb = QwtPlot::xBottom;
  2.     int yl = QwtPlot::yLeft;
  3.     curv1->setAxes(xb,yl);
  4.     myPlot->enableAxis(yl);
  5.     curv1->attach(myPlot);
  6.  
  7.     int xb2 = QwtPlot::xBottom;
  8.     int yl2 = QwtPlot::yLeft+1;
  9.     curv2->setAxes(xb2,yl2);
  10.     myPlot->enableAxis(yl2);
  11.     curv2->attach(myPlot);
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Qt Code: 
  1. d_zoomer[0] = new Zoomer( xb, yl,
  2.         myPlot->canvas());
  3.    d_zoomer[0]->setRubberBand(QwtPicker::RectRubberBand);
  4.    d_zoomer[0]->setTrackerPen(QColor(Qt::white));
  5.  
  6.    d_zoomer1[0] = new Zoomer( xb2, yl2,
  7.         myPlot->canvas());
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But when I want to zoom chart, for example, as shown in the attached picture, chart scale is not between 0 and 1 on the axis X, and from 0 to 0.12.
qwt2.jpg
qwt3.jpg

What am I doing wrong?