How do you change the aspect ratio of your videos in CyberLink PowerDirector 8 Ultra?

Trying to change the ratio from 4:3 to 16:9. Anyone know how to do this?How do you change the aspect ratio of your videos in CyberLink PowerDirector 8 Ultra?You can have a try RZ Video Converter which can change the ratio from 4:3 to 16:9 easily, it also can convert any videos or audios between different formats, you can yahoo or google search and download it, hope it can help you.