Sparklines in Flex

My last project was to build a dashboard where the main goal was to prove that it was possible to build Decision Support System using sparklines as the main data visualization component.
So I went searching for sparkline implementations and I found it on several programming languages such as PHP, Ruby and even VB.net. Here is what I consider a good implementation in PHP. Nonetheless, I had to build then using Flex 2 or Flash 9, so I went Flex 2 + Flex Charting API.
Just before getting in more details about the implementation there are a few issues that must be kept in mind when building Sparklines: