The Change event is generated when the contents of a
control have changed and can be used to synchronize or coordinate
data display among controls. For example, you can use the control's
Change event to check for text at certain screen location and
then a list box which contains that text.
Modifying the contents of the virtual display by setting the
Text property or calling the Write method in the event
handler can cause a cascading event. It is recommended that you only
read, not modify, the contents of the virtual display when this even
occurs.