I am including a sample done in ObjectARX (The C++ SLN) (it took me like 5 minutes to write) and the arx release file for AutoCAD 2004-2006, it is a very simple routine. Once I became comfortable with .NET I will start posting some samples too.
Have fun.
btw, there is a solution sample provided in the ARX SDK about "blockview", that has more options included.