Opens when you click Compare Options 
on the Compare dialog box toolbar and allows you to customize the colors that the various comparison
states are displayed in. The active color scheme is displayed in the Compare dialog box status bar.
Left-only items — Allows you to choose a color for displaying objects that exist only in the left-hand Drawing view. Dark green is the default color for this option.
Right-only items — Allows you to choose a color for displaying objects that exist only in the right-hand Drawing view. Red is the default color for this option.
Different items — Allows you to choose a color for displaying items that exist in both views but differ from each other for any number of reasons (for example, modified properties, changed connectivity, and so forth). Blue is the default color for this option.
Default items — Allows you to choose a color for displaying drawing items that are identical in the two views. Black is the default color for this option.
Highlight items — Allows you to choose a color to denote that a drawing object is highlighted, for instance, when an item is within your locate zone.
Selected items — Allows you to choose a color to denote items that are selected in one or both of the Drawing views.