Hi Everyone,

I have graph, design by qwtplot, in which added multiple graphs using qwtplotcurve and its marker is display on qwtplotlegend.
Now I can see the curve information on the legend, and also able to clicked and checked to make it disable and enable.

Now I want to change the color of the curve. but question is how ?
And I want to do that only on double clicked event. Or anyone has other better way to do it, then please mention.