Portion of a display panel with a graphical user interface

<figref idref="DRAWINGS">FIG. <b>1</b></figref> is a front view of a portion of a display panel with a graphical user interface showing our new design in a first image.

<figref idref="DRAWINGS">FIG. <b>2</b></figref> is a front view of a portion of a display panel with a graphical user interface showing our new design in a second image; and,

<figref idref="DRAWINGS">FIG. <b>3</b></figref> is a front view of a portion of a display panel with a graphical user interface showing our new design in a third image.

The broken lines including the showing of a portion of a display panel with the illustrated graphical user interface and the portions of the graphical user interface are included for the purpose of illustrating environmental structure and form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in <figref idref="DRAWINGS">FIGS. <b>1</b>-<b>3</b></figref>. No ornamental aspects are associated with the process or period in which one image transitions to another image.