Correct my impression if I am wrong. Do you want a menu with an icon that you click on to play the content of the .wmv file? If so the only way to get there with DVD Flick is to convert eaxh .wmv as a Title. This uses up space as DVD Flick will convert each .wmv file to a DVD Video title.
If you have a DVD Player that can play .wmv the alternative is to use Imgburn to burn a Data DVD with the 7 .wmv files as data files. Most DVD Players that can play .wmv will show a menu with the names of the videos. The Official ImgBurn Website
I haven't used DVD Flick Menu wizard very often. But I believe it just uses text buttons on an image background. In any case I don't know of any software that does menus for .wmv. Converting .wmv to DVD Video is a last resort as the .wmv format can even have HD resolution where the DVD Video format is limited to 720x576 for PAL and 720x480 for NTSC.
Are the .wmv files SD or HD?
What make and model DVD Player do you have?