What is claimed is the ornamental design for a display panel of a programmed computer system with a graphical user interface, as shown and described.
FIG. 1 is a face view of a first state of a first embodiment of a display panel of a programmed computer system with a graphical user interface.
FIG. 2 is a face view of a second state thereof.
FIG. 3 is a face view of a first state of a second embodiment of a display panel of a programmed computer system with a graphical user interface; and,
FIG. 4 is a face view of a second state thereof.
The broken lines in the drawings 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 FIGS. 1-2 and between the images shown in FIGS. 3-4. The process or period in which one image transitions to another image forms no part of the claimed design.