No "XXX" Constant properties or static methods

I try to insert operand through matlab in zemax with the code below:

MCEVigoperand=[{'FVDX'},{'FVDY'},{'FVCX'},{'FVCY'},{'FVAN'}]; Operand_MCE_num.ChangeType(ZOSAPI.Editors.MCE.MultiConfigOperandType.MCEVigoperand{1});

then I get back an error message "no "MCEVigoperand" Constant properties or static methods" If change the code as below:

Operand_MCE_num.ChangeType(ZOSAPI.Editors.MCE.MultiConfigOperandType.FVDX);

It will be OK. How can I get the code to work through assign an vector or a cell? Thanks!