Natural Table does not allow using defined typing in its cell

[Eugene Toporov <eugene.toporov@gmail.com>]

Hello,

I found a strange (to me) bTABLE behaviour.

I'm defining the "programlisting" typing and it works when used like below 

\def\BeforeProgramListing{\startframedtext[background=screen,width=\hsize,style=\tttf\small]}
\def\AfterProgramListing{\stopframedtext}
\definetyping[programlisting][before=\BeforeProgramListing,after=\AfterProgramListing]

 \startprogramlisting
    "Hello World! Hello" + txtName.text + "!"
 \stopprogramlisting

When I'm trying to insert a programlisting into a table cell using the
following code -- it fails to create PDF.

\bTABLE
   \bTR   
     \bTD Set the value to \eTD   
     \bTD 
       \startprogramlisting 
         "Hello World! Hello" + txtName.text + "!" 
       \stopprogramlisting   
     \eTD    
   \eTR 
\eTABLE

When I replace \start\stopprogramlisting with in place
\start\stopframedtext -- it works ok.
     \bTD   
       \startframedtext[background=screen,width=\hsize,style=\tttf\small]
         "Hello World! Hello" + txtName.text + "!" 
       \stopframedtext   
     \eTD    


Why is this so? Do I miss something important?

Thanks a lot.

-- 
Regards.
Eugene Toporov