why “Expression” option in “Property” of “MainSequence callback” is disable?

[Time_Walker]

hello Sir/Miss:

  i had a sequence file.i want to change “Expression” option in “Property” of “MainSequence callback”, but the button is gray,why?

[Norbert_B]

The MainSequence Callback step is a SequenceCall steptype. The typedefinition of this step disables the possibility to change the status expression.

hope this helps,

Norbert

[Time_Walker]

dear  Norbert B

   thank you very much

viming.chen