Excellent! Very good.
So far, so good! I have used this calculator a lot and I especially like the equation history feature and the real-time calculating! I love that you can edit calculations instead of having to start over like you have to on a traditional calculator.
Thus should be the default calculator! I don't know why we need to press enter before.
Added a new dialog at the very beginning which offers easy help on what the Real Time Calculator is. Also fixed a couple bugs.