Dear Hans, Wolfgang,
Both of your methods are working well.
Using \frame, the \dorecurse problem is solved.
\starttext
\startanimation
[
menu
=
yes
]
\dorecurse
{
10
}
{
\frame
{
\useMPgraphic
[
stacking
=
{
#
1
}
]
{
demo
}}}
\stopanimation
\stoptext
Thank you for your solutions.
Best regards,
Dalyoung