The ornamental design for a displaypanel of an electronic golf device with a computer generated icon, as shown and described.
FIG. 1 presents a front view of a display panel of an electronic golf device with a computer generated icon in accordance with the present design; and,
FIG. 2 presents a perspective view of the display panel of the electronic golf device with the computer generated icon in accordance with the present design.
The broken lines showing the electronic golf device in FIG. 2 form no part of the claimed design.