DECSET$ENVMGR.HLB  —  cgui  file selection Box
    A file selection box is used to traverse through directories,
    display the files and subdirectories in them, and then to select
    either a file or subdirectory for the value to return from the
    box.

    File Selection Boxes have five main areas:

    o  A text field for specifying and editing a directory filter
       mask to select the files or subdirectories to be displayed.

    o  A scrollable list of subdirectory names.

    o  A scrollable list of file or subdirectory names that match
       filter value.

    o  A text input field for displaying and editing the selection
       value to be return from the box.

    o  A group of buttons labeled OK, Filter, Cancel and Help.

       -  The OK button is used to accept the value in the
          selection text field and to return that value from
          the file selection box.

       -  The Filter button is used to filter the directory and
          file mask specified in the filter text field.

       -  The Cancel button is used to dismiss the file selection
          box without returning a selected value.

       -  The Help button is used to display this help text.
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