package com.vamapaull.utils
{
	public class ColorToHexadecimal
	{
		public static function convertToHexString(number:Number):String
		{
			var hexColor:String = number.toString(16);
			while(hexColor.length < 6)
				hexColor = "0" + hexColor;
 
			return hexColor;
		}
	}
}

http://vamapaull.com/color-value-to-hexadecimal/

A simple utility class that will help you convert a color value (from numbers) to hexadecimal color value.

Color Value To Hexadecimal

number, color

ActionScript 3