Really enjoying using this program, good work!

I have a question on the way the program handles the project end date.  If I have 3 tasks a,b and c.

If they all have 10 days duration and are setup up so when 'a' finishes, 'b' can start and then when 

 'b' finishes 'c' starts.  This means that the project will have a duration of 30 days.  If 'b' is then finished 

 and set to being 100% complete before 'a' has finished, the project end date is not brought in.  It just

 leaves a space.  Can this not be done automatically?