Event Viewer needs a combobox to select some kind of object to group reportmessages by object type.
Now, reportmessages are Error,Informational or Warning.
For example, there are errors related to subassemblies (corridors), surfaces (generally intersections among breaklines), etc..
Obviously, you could show all if you select "ALL".
A reportmassege might be related to several objects, so the same reportmessage can appear in several objects.
Also, (Error, Informational, Warning) should be a combobox, like this:
-ALL.
-Error.
-Informational.
-Warning.
Not 3 checkbox in the "Filter Event" dialog box.