True if the specified slide or range of slides follows the slide master background. False if the specified slide or range of slides has a custom background. Read/write Long.
Remarks
When you create a new slide, the default value for this property is True. If you copy a slide from another presentation, it retains the setting it had in the original presentation. That is, if the slide followed the slide master background in the original presentation, it will automatically follow the slide master background in the new presentation; or, if the slide had a custom background, it will retain that custom background.
Note that the look of the slide's background is determined by the color scheme and background objects as well as by the background itself. If setting the FollowMasterBackground property alone doesn't give you the results you want, try setting the ColorScheme and DisplayMasterShapes properties as well.