Vista Style Builder

Sorry if this has been asked before but I'm not sure what search term to use for this.

I'm modding a visual style using properties from another visual style (so I can have the best features of both for my personal taste.)


I've noticed that some of the locations have additional locations within its branch e.g.:




On the left Tab>TabItem has one item but on the right TabItem contains an additional 2 items (not sure what the correct name for this is) <2> & <3>.

I cannot find a way to add additional items to the tree any ideas?


Also while I'm here could someone point me in the right direction on how to create .theme files from .msstyles?

Thanks