customizing statuses in mantis

I need to setup mantis so that there are different status for example:

status list: Workflow list:
Bugs: new, assigned, opened, fixed, closed.

Tasks: new, assigned, opened, closed.

Enhancement request: new, assigned, opened, closed,

Milestones: new, passed.

I tried to use categories for setting up the status list but all options are avaiable for all items thus no workflow.

Please let me know how I can set mantis up so that if you select Milestone as the type of bug or status of a bug that the options in the change status to drop down show olny new and passed etc.

Thanks