I'd like to post an update to this thread. Yes, there is indeed a way to create so called "pull-right" properties for XControls.
Someone from NI informed me of a way that is not officially supported by them but none-the-less works.
All you need to do is change the localized long name of the property to include the nesting. For Example: If you have a property called My New Nested Property 1 and you want the menu to appear like Mike->My New Nested Property 1, set the Localized Long Name to Mike:My New Nested Property 1. Colon is used as the separator.
Further experimenting reveals you can also create line seperators by replacing the name completely with a hyphen "-". Of course, this means you lose access to the property since now it's not selectable. You would probably create dummy properties to support this.