Step 3: Declare visual classes and global functions
You declare
native visual classes in the same way as nonvisual classes, except that
you declare an ANSI C++ class that inherits from
IPBX_VisualObject, which is the ancestor class for all
nonvisual PowerBuilder native classes, instead of from IPBX_NonVisualObject.
You can also declare global functions in a visual extension. See "Step 3: Declare native classes
and global functions" in the section
on nonvisual extensions.