The ornamental design for a shower panelguide, as shown and described.
FIG. 1 is a perspective view of a shower panel guide, according to our new design, with a transparent shower wall panel and a transparent shower door shown in dotted lines;
FIG. 2 is another perspective view of the shower panel guide shown in FIG. 1, without the wall panel and shower door;
FIG. 3 is a front view of the shower panel guide shown in FIG. 2;
FIG. 4 is a rear view of the shower panel guide shown in FIG. 2;
FIG. 5 is a left side view of the shower panel guide shown in FIG. 2;
FIG. 6 is a right side view of the shower panel guide shown in FIG. 2;
FIG. 7 is a top view of the shower panel guide shown in FIG. 2; and,
FIG. 8 is a bottom view of the shower panel guide shown in FIG. 2.
The broken lines showing shower doors are for the purposes of illustrating environment and form no part of the claimed design.
The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.