lnFormCount = _SCREEN.FORMCOUNT
FOR I = 1 TO lnFormCount
  IF TYPE("_SCREEN.FORMS(I).BASECLASS") = "C
    _SCREEN.FORMS[I].RELEASE()
  ENDIF
NEXT

I am not the most powerful man in this world.
I am not the worst man in this world either.
I just as same as all of you.
I still need to learn from my mistakes...