How to display external legends in Qwt?

Hi everyone,

I'm trying to create a plot with an external legends. I looked forward some simple instructions which show me the way.

I know that after configuring the legends, I have to use this instruction:

Code:

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insertLegend(d_legend, QwtPlot::ExternalLegend);

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but I couldn't find a way to print them. Usually people say use printlegend (or something) to do that. I tried but it was unsuccessful :(

Would you please send me a simple piece of code which shows how to that?
Consider that my plot name is Plot and put the legend in a layout named HLayout.

Thanks