Thank You, thats a great article.
As a side note - to modernize the display of the "desktop" you can use one of this flags in property ViewOptionsEx:
wpPaintThemedBackground, // use the VCL theme engine to draw background.
wpPaintPageShade, // draw a shadow around pages. cannot be combined with wpUseThemedBackground
The ruler has this DrawOptions:
and this option may also be important: wpNoVertRulerAttached - if enabled the ruler will draw the lowest line over the completewidth, otherwise the line is shrinked to make room for a vertical ruler. BTW: WPTools supports VCL themes since V7.