How to add QwtLegend for specific case?

[excalybur96]

Hi, i want to add qwtlegend for my curves but i want to group them. For example, i have 3 red , 2 green and 2 blue curves and i want to add just one legend for different color but qwt adds legends for each curves. I want to add like this:13596 Do you have any idea?

[ChristianEhrlicher]

Why do you double-post?
https://www.qtcentre.org/threads/71516-How-to-add-QwtLegend-for-specific-case