This class uses four indices into the image list to describe
the button in each of the possible states: Out&Enabled,
In&Enabled, Out&Disabled and In&Disabled. An array of
instances of this class are passed into the method ICustButton::SetFlyOff().
Data Members:
These four data members are indices into the image list. They
indicate which images to use for each of the four possible button
states:
You may specify a unique image for each one of these states by
passing a different index for each state. Or you may supply a
single image to be used for all the states by specifying the same
index four times.