SharpDevelop Core, custom doozer problem

hi,

i would to use this:

<Filter group="Text Files"><Filter id = "Text" description = "Text files" extension = ".txt"/><Filter id = "LogFiles" description = "Log files" extension = ".log"/>

</Filter>

but in the group are all subitems of all items not only of the addin who contains the definition.

how can i solve the problem?

thanks alot