Changing the editor kit for opened documents

Hi all,

I am trying to extend the editor in the way that you can chose the
syntax coloring for opened documents. But how do I change the editor kit
for a currently open document? Just setting a new kit using
setEditorKit() does not seem to solve the problem. Is there any way to
change the editor kit or can this only be done by closing and reopening
the document with the new editor kit?

Thanks in advance for any help,
Tilman Giese