Programmatically open an item in its form

Hi,

What I try to do is:

1) I have an action added to ItemType XXX, associate the server method to it which follows some business rules to create another item of ItemType YYY.

2) User can find the new item YYY in TOC, then open it manually. They want to open the YYY automatically immediate after its creation.

How can I do this?  Any example would be helpful.

Thanks a lot