How does the model get recalculated?
There are several ways to recalculate the model. The easiest way is to simply change the data in one of the input fields. In order to effect a change in a text field, you must hit the tab key or select another field with the mouse after you have typed in new data. Note that hitting the return key will not cause a recalc. You can also recalc by clicking on a radio button or check box, or by changing the selected item in a drop-down list. Finally, you can recalc at any time by clicking on the recalc button.
