However if you want the typical representation where leading 0s are not dropped, then I’ve modified the script to do so. E.g. you want it to be represented as 0x00AA00 and not 0xAA00.

var c:uint = 0x00AA00;

trace (c);
var s:String = c.toString(16).toUpperCase();

while(s.length < 6)
{
s = "0" + s;
}

s = "0x" + s;

trace (s);

trace (uint(s));