FIG. 1 is a front elevation of a dual control slide dimmer showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken line is for illustrative purposes only and forms no part of the claimed design.