The ornamental design for a controlpanel, as shown and described.
FIG. 1 is a top front perspective view of a control panel showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a first end view thereof; and,
FIG. 5 is a second end view thereof.
The back and bottom views are omitted from the drawing disclosure of the control panel as being devoid of surface ornamentation and not a part of the claimed control panel design.
The broken lines in the figures show unclaimed subject matter and form no part of the claimed design.