DVD Flick has its own (realy old version) of imgburn.exe.
If you want to do the thing in one step, replace the the old .exe from Program Files\DVD Flick\imgburn\ with the new one from Program Files\ImgBurn\
I personaly prefer and recommend to do the thing in two steps, that way you can check if everything is as expected before it's too late.
Anyway, what "still did not work"? Post a log. http://forum.imgburn.com/index.php?showtopic=14632