How to show (TV) Auto-Tag(s) in manager Per Context?

Hi,
I wonder if it is possible to have an Auto-Tag template variable show only the tags that are used within the current context?

Case: Magazine publisher.
- Every magazine has it's own context.
- An Article-resource has a TV 'Category' which is an Auto-Tag.
- Every magazine has it's own named categories.

How can MODx only show the appropriate categories for the current magazine (context)?

Maybe a plugin which acts onTVPreFormRender?

All pointers are very welcome.

Thanks

I think you could do it with a Form Customization rule setting visible with a constraint of context_key='contextName'.

Another way to do it would be to use different, but identical templates for the different contexts and just connect the TVs to the appropriate template.

Thanks BobRay,

I'm not quite getting the hang of the form customization yet... (there's not a lot of documentation on it either)
Will try some more.

Different templates will be my last resource. We're creating a platform for a lot of magazines/contexts, I do not want to create different templates for every magazine unless it's unavoidable.

I find Form Customization confusing too.