function toHex() {
			function hex(val) {
				val = parseInt(val, 10).toString(16);

				return val.length > 1 ? val : '0' + val;
			}

			return '#' + hex(r) + hex(g) + hex(b);
		}
Returns the hex string of the current color. For example: #ff00ff

@method toHex
@return {String} Hex string of current color.