The ornamental design for a casing for a controldevice, as shown and described.
FIG. 1 is a front elevation view of the casing for a control device of the present invention;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a perspective view thereof in a closed position; and,
FIG. 8 is a perspective view thereof in an open position.
The broken lines immediately adjacent to the claimed areas in the views represent the boundaries of the design. The broken lines in figures illustrate the portions of the design that form no part of the claim. None of the broken lines form any part of the claimed design.