When the documentation for a custom tool includes a graphic (illustration) the full path to the graphic must be included for it to display correctly. When only the graphic name is specified an 'empty graphic' icon appears in the help doc.
When the full path is included, further issues are raised when the custom tool is shared. To have the graphic display correctly, all users sharing the tool must have access to the location of the graphic.
Functionality that allows users to specify graphic file names and the application to look to the same folder as the parent tbx (toolbox) file must be added.