[NTG-context] right align (flushright) bibliography list labels

[Csikos Bela]

Hello list members:

I would like to align the labels (numbers) of the bibliography list to the right to look like this:

...1
...2
......
..11
......
.121.

I tried to use the numbercommand=  like this:

% start code
\def\numcom#1{\startalignment[flushright] #1.\stopalignment}

\setupbibtex[database={bibfile}]

\setuppublications[alternative=apa,refcommand=num,sorttype=cite,numbering=yes,autohang=no,numbercommand=\numcom]

\starttext

\completepublications[criterium=all]

\stoptext
% end code

But this has no effect on label alignment.

I also tried,  based on this post, http://www.ntg.nl/pipermail/ntg-context/2015/080696.html, this code:

% start code
\setupbibtex[database={bibfile}]

\setuppublications[alternative=apa,refcommand=num,sorttype=cite,numbering=yes,autohang=no,numbercommand=\numcom]

\setupbtxlist[align={flushright}]

\starttext

\completepublications[criterium=all]

\stoptext
% end code

In this case compilation stopped with error, it choked on \setupbtxlist (Undefined control sequence).

How could I solve this?

Thanks,

bcsikos