When looking at the code in the Programmer's Guide (PDF), it appears as if some variable names are incorrect i.e. missing the leading _ character. This is becuase at various resolutions, the PDF engine fails to display these underscore marks (they still print correctly)
To bypass this issue, work form the Programmer's Guide in the .chm help file, or download the Microsoft Word version at the following link:
http://www.crainiate.net/downloads/Objecto Programmers Guide.doc