The motivation for doing that:
Our program stores font info in the drawing. It may happen that I save the picture on one machine, take it to the other one, edit it there and take it back to the first one. Now suppose the first machine has font "StrangeFont CE" while the second one does not. We do not want to convert anything if the user does not intend to (we just display some other font but save with the original one).
To make the things more complicated (we do zooming), we save font height as double, negative meaning "height undefined" - ie. specified by other means. (Therefore the two added controls to the dialog.)
1. Adds two controls and handles them, using DDX and Fail() method as well. It also shows handling of WM_ACTIVATEAPP and WM_QUERYENDSESSION not to pop-up error messagebox in vain.
2. It adds a special font to the combo box and if it is selected, disables font style and script combos.