To use custom dialog boxes, perform two tasks:

1. Create a class that derives from C1Window and implements the ISpellDialog interface.
2. Use the overloaded version of the CheckControlAsync method that takes the ISpellDialog parameter.

To make the first task easier, we provide two dialog boxes that you can use as a starting point when creating your own dialog boxes. One of them is identical to the built-in dialog box, whereas the other is similar to the dialog box for the spelling checker in Microsoft Word. You can find the source code in the "SpellCheckerSample" application that is installed in the "Samples" folder along with the product.

This is what the second custom dialog box looks like: