_toggleCallback() {
		if (this.visible) {
			if (typeof this.toggle.callback.in == 'function') {
				return this.toggle.callback.in.call(this.element, this)
			}
		} else {
			if (typeof this.toggle.callback.out == 'function') {
				return this.toggle.callback.out.call(this.element, this)
			}
		}
	}
Toggles the callback
@private
@return null|Promise