quick help:cannot initialize the zoomer into a specific rect

[fatecasino]

Hi,
When I am loading a new plot I try to have the zoom directly zoomed in a specific area:QRectF currentRect:

QRectF currentRect(topleft,bottomright);
m_zoomer->setEnabled(true);
m_zoomer->setZoomBase(currentRect);
//m_zoomer->setZoomBase( true) ; I tried this as well
myPlot->replot();

QRectF currentRect(topleft,bottomright);
m_zoomer->setEnabled(true);
m_zoomer->setZoomBase(currentRect);
//m_zoomer->setZoomBase( true) ; I tried this as well
myPlot->replot();

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However the the zoomer does not go to that area, it does nothing.
Probably I am missing an important zoomer funciton!
Any help?