WP-dTree View Permissions?

hello,

for my company’s blog, i installed wp. i wanted to make sure only members of blog be able to see and read posts and categories, i couldn’t do this with wordpress itself, so i installed a plugin called “RYO category visibility” and it solved my problem. but now that i installed WP-dTree, all categories and posts within them are again accessible by unauthorized users. wp-dtree is a great plugin and i really want to have it.

so, does anyone have any suggestions for me? a way to have WP-dTree , but only logged-in members can see and read its contents, and other visitors don’t have any access to view any of contets?

thank you.

http://ww.wp.xz.cn/extend/plugins/wp-dtree-30/