To change the thumbnail image (by default, MyDVD uses the first frame in the video or the initial photo in a slideshow as the button's thumbnail). To assign a new image to a button, click the button to select it and then click the More Setting button on the second row of the Preview pane's toolbar (this is the very last button on the right).
When MyDVD opens a settings dialog box, click the Style tab and then click the Custom option button in the Thumbnail section (doing this automatically de-selects the Use Link Menu/Movie option butoon as well as activates the Browse button). Click the Browse button to open the Movie dialog box and then select the image to use as the button's thumbnail.
The Movie dialog box is initially set up to find only video files in theSmart Objects, albums, and folders you select in the Movie dialog box. In order to select a still image as the button thumbnail, you must remember to take the extra step of changing the Files of Type setting to one of the accepted graphics file formats (BMP, MPG, GIF, PNG, or TIFF).
Hope that does it!!