[NTG-context] \startanimation and \dorecurse

Hi, I tested the following simple code to generate enlarging circles as a test of animation. But it just draw 5 circles in a row. \usemodule[animation] \setupinteraction[state=start] \startbuffer[Circles] numeric u; u:= 1cm; draw fullcircle scaled \MPrawvar{Circles}{s}u; \stopbuffer \starttext \startanimation { \dorecurse{5}{% \setupMPvariables[Circles][s=\recurselevel] \processMPbuffer [Circles] }} \stopanimation \stoptext It seems to me that \startanimation just treat the figures {\dorecurse … } as just one figure. Is there a way to treat it 5 figures to generate animation? Thank you for reading. Best regards, Dalyoung