idlwave-abbrev-change-case

idlwave-abbrev-change-case is a variable defined in `idlwave.el'.
Its value is

nil

Documentation:
Non-nil means all abbrevs will be forced to either upper or lower case.
If the value t, all expanded abbrevs will be upper case.
If the value is 'down then abbrevs will be forced to lower case.
If nil, the case will not change.
If `idlwave-reserved-word-upcase' is non-nil, reserved words will always be
upper case, regardless of this variable.

You can customize this variable.