FIG. 1 is a bottom plan view of an operating button in accordance with a first embodiment of my design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof; and
FIG. 7 is a perspective view thereof;
FIG. 8 is a right side elevational view of the operating button showing an alternate environment;
FIG. 9 is a top plan view thereof;
FIG. 10 is a left side elevational view thereof;
FIG. 11 is a front elevational view thereof;
FIG. 12 is a rear elevational view thereof; and
FIG. 13 is a perspective view thereof;
FIG. 14 is a right side elevational view of the operating button showing an alternate environment;
FIG. 15 is a top plan view thereof;
FIG. 16 is a left side elevational view thereof;
FIG. 17 is a front elevational view thereof;
FIG. 18 is a rear elevational view thereof; and,
FIG. 19 is a perspective view thereof.
The broken lines shown form unclaimed portions of an operating button that do not form part of the claimed design.