Open Spec File Dialog
    The Open Spec File Dialog lists all the files
      contained in the Specification
            file, organized by file type.    
    
      - The tabs in the View File Types:
          and View Structures: bars at the top of the dialog
          allow the user to view a subset of the data files by clicking
          on a specific file or structure type. 
      - Checkboxes on the left indicate which
          files will be loaded once the Load button, in the
          lower right, is pressed. All files are selected by default.
          Toggle off a checkbox to keep those files from being
          loaded.  To check or uncheck all the files, click All
          or None in the Select Files: bar near the top
          of the dialog.
      - The Data Type, Structure,
          and Data File Name headers can also be clicked to sort
          the list of files by these attributes.
      - The More  gear buttons to the right of each checkbox will, once
          implemented, allow the user to select options to Set the
            Structure for a file (e.g. Cerebellum, Cortex Left,
          etc.) or to View Metadata associated with the file.
          Clicking on these buttons now,  will display these
          options as greyed out, indicating that this feature is not yet
          implemented. gear buttons to the right of each checkbox will, once
          implemented, allow the user to select options to Set the
            Structure for a file (e.g. Cerebellum, Cortex Left,
          etc.) or to View Metadata associated with the file.
          Clicking on these buttons now,  will display these
          options as greyed out, indicating that this feature is not yet
          implemented.
 
    