Joomla Menu and VM Subcategories

[Scylla]

I've got the following problem

In VM I've created a category with 2 sublevel categories

Code Select Expand

-Cat 1
-- Cat 1.1
--- Cat 1.1.1
--- Cat 1.1.2
-- Cat 1.2
--- Cat 1.2.1
-Cat 2

Now I entered a link for each category into my Joomla Mainmenu (same structure as above with linktype "Category Layout" for each item)

When I use the mainmenu for navigation the 3rd level menu items will show up. But if I navigate through the category view of VM only the 1st and 2nd level will show up.
Is there any possibility to expand the 3rd level menu items (1.1.1, etc.) in the Joomla mainmenu when I browse from the maincategory (here: Cat 1) to a subcategory (e.g. Cat 1.1) within the category view in the main div.

Joomla: 2.5.4
VM: 2.0.6
Template: modified beez_20 Template