Create a white background box using ArcPlot or ArcTools

In ArcPlot or in an AML, use the following commands to draw a white box, which will print white in the final product:

Code:
shadedelete all
shadeset color.shd
shadesymbol 1
shadecolor white
patch <* | xmin ymin xmax ymax>

Using ArcTools, the same effect can be achieved with the following steps:
Go to Map > Properties and change shadeset to color.shd.

Draw the shaded box in the desired location, selecting shadesymbol 16 and shadecolor white.