To have a Gradient Background Color in Model views, use the Advanced Options
XS_BACKGROUND_COLOR1, XS_BACKGROUND_COLOR2, XS_BACKGROUND_COLOR3 & XS_BACKGROUND_COLOR4 With these advance options we can Control the color in the Model view.
Example
•Use 0.0 0.0 0.0 for black background.
•Use 1.0 1.0 1.0 for white background.