QwtPlotZoomer example

I am looking for example of how to use the QwtPlotZoomer in conjunction with my QwtPlot.
I need something like if the user click the zoom in button, it zooms in, and zoom out button for zoom out.
Thanks.

there is at least one example using a zoomer delivered with qwt, did you check that?

how to use the zoomer is explained in the docs.

Sorry, I just notice that. Initially I go the dll library without realized there were examples there. Thanks.