Cannot see anything from #prefix and #suffix fields

I placed some table tags in #prefix and #suffix fields of the $forms array, but i cannot see anything in render开发者_如何学Goed page, why?

If you provide a copy of the form code, that would make debugging a lot easier.

One reason, could be the form items you added #suffix and #prefix to don't support it. You can check the Form API.
Another possibility is that you simply made a mistake when you made them, or are using a theming function that doesn't render them.

But this is merely guesses...