The ornamental design for a media controlpanel for a portable computing device, as shown and described.
FIG. 1 is a top plan view of a media control panel for a portable computing
device showing my new design, where the top portion of the portable
computing device is in an open position; and,
FIG. 2 is a front elevational view thereof.
The broken line showing of a portable computing device in FIGS. 1-2 are
environmental only and form no part of the claimed design.