Vignette creation for CUSTOM shape graphic ...... Possible?

Work with X3 but have a 30 day trial version now of X8 .... trying to create a vignette around a custom shape I created ( not a circle or square option corel lets you select ) but a folder I built and power clipped a photo inside of it and now want the vignette  to follow around the outside of that  new shape. Cannot find an option or process for the vignette to follow the shape I built, it limits me to choose from one of the standards corel offers. Any help would be appreciated or a NO can't be done

Thanks - Mark