Control Button of Controller for Electronic Device

FIG. 1 is a first perspective view of a control button of controller for electronic device showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view showing a usage state thereof.

The broken lines on the control button of controller for electronic device depict portions of the control button that form no part of the claimed design. The broken lines showing a controller in FIG. 9 depict environmental subject matter that form no part of the claimed design.