code: function(rgb, silent) {
              silent = (silent) || false;
              this.set(this.OPT.RGB, rgb, silent);
              this._updateSliders();
          }
docs: Sets the control to the specified rgb value and
  moves the sliders to the proper positions
  @method setValue
  @param rgb {[int, int, int]} the rgb value
  @param silent {boolean} whether or not to fire the change event