The ornamental design for a ceilingpanel, as shown.
FIG. 1 is a front perspective view of a first embodiment of our new design; The broken lines illustrating the suspension hardware and additional like ceiling panels are for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a bottom plan view of a portion of FIG. 1;
FIG. 3 is a front perspective view of a second embodiment of our new design. The broken lines illustrating the suspension hardware and additional like ceiling panels are for illustrative purposes only and form no part of the claimed design; and,
FIG. 4 is a bottom plan view of a portion of FIG. 3.