Updated
Here are some recommendations:
- Visfire is free.
- StockChart SL VERY professional but it costs $2000-3000 USD.
- ZedGraph is also free, but it's just C#.
I'm a sucker for free stuff, but if you're working for a company that has extra cash to shell out at the most fancy stuff out there, then you can try StockChart SL, otherwise it looks like Visfire should do it for you.
