START Dialog usage of %_ variables

#1
Code:
c:\users\jlc\utils>ver

TCC  23.00.28 x64   Windows 7 [Version 6.1.7601]
When I use the START dialog with a variable name for the title;
1537099550031.png

...it literally uses the %_ variable name in the resulting title;
1537099650472.png

If I run same from the command line as;
Code:
c:\users\jlc\utils>START "%_time" /Dc:\utils /REALTIME /PGM dir
...it uses the result of the %_ variable;
1537099731073.png

...which is what I want. The START /= dialog should also do this, instead of using the literal %_ variable name.

Joe