when you apply a matrox page curl, the page curls page appears:

to set up a page curl:
1 choose the type of effect you are looking for in the directory.
2 click the particular effect you want from the effect list.
3 to see a preview of your effect at any time, click the preview button.
4 to create a soft edge on your page curl, select allow changes, then drag the softness slider.
5 if you want to apply or change various transform settings, such as to change your clip's size, position, and rotation settings, see "transforming your clip" on page 81.
6 when you are satisfied with your effect, click ok to return to your timeline.