The Package Explorer+ view is just like the standard
Package Explorer view except that it has been enhanced with COLOR.
By default, modified elements are shown in blue and elements with
errors are shown with a light red background. Optionally, elements
with warnings can be highlighted with a light yellow background and
elements modified since a specific checkpoint time can be highlighted
with a light green background color. Options are provided via a preference
page to set various foreground and background colors.