The ornamental design for a displaypanelportion with a computer generated icon, as shown and described.
The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
The FIGURE is a front view of a display panel portion with a computer generated icon showing my new design.
The broken line bordering the FIGURE and illustrating the display panel portion forms no part of the claimed design.