Answer for Why the controls on the DocGen application are disabled or not seen?

Reinstall the latest version of the DocGen application. To install the add-in:
1.  Go to Admin section.
2.  Click on “QPack Docgen Setup” link under “Apps & Add-Ons
3.  A setup file is downloaded. It is recommended to run setup using “Run as administrator” option.
4.  QPack Docgen is installed on ~\program files (x86)\QPackClient\QPackDocGen.exe
5.  Run the setup

Running the application
The application should be always run in “Run as Administrator”.
DocGen window will open successfully.

All items will display properly now.