Am 14.05.2011 um 03:11 schrieb Jeong Dalyoung:

> But I couldn't make it work with lines of formulas. I think that it is not working with \NC, \NR structure.

That’s weird because it works for me with the example you sent.

\usemodule[pre-60] 

\setupinteraction[state=start]

\starttext 

\StartSteps 
\startformula\startalign 
\NC T(4) \NC = T(3) + 4          \NR\FlushStep
\NC      \NC= T(2) + 3 + 4       \NR\FlushStep 
\NC      \NC= T(1) + 2 + 3 + 4   \NR\FlushStep 
\NC      \NC= 1 + 2 + 3 + 4 = 10 \NR\FlushStep 
\stopalign\stopformula 
\StopSteps 

\stoptext

Wolfgang