We are going to make our option calculator
a more useful tool by allowing it to make two different types of calculations.
We will do this by adding two button controls now, and the code behind
them later.

One button will calculate the option
price if you already know the Implied Volatility.

The other button will calculate the
Implied Volatility if you already know the option price.

See the page "Ways
to use the Option Calculator" for examples of how each type of calculation
will come in handy.

For now, we just need to be able to
tell the program which way we want to use it. In Design View, add the
three controls and their Properties as shown below: