I want to have a submenu on grandchild page that shows other grandchildren. For example:

Page A is the top level.
Page B is a child of Page A
Page X is a child of Page B
Page Y is a child of Page B
Page Z is a child of Page B

When someone goes to page B , the submenu will show X, Y and Z , this is no problem.

When someone goes to page X , I want the submenu to show X, Y and Z . However x, Y and Z are not child of X so how do I show them. < %control children > obviously will not work.

Ideas or suggestions? Thanks

***** Update *****

I found the answer here -
http://doc.silverstripe.org/old/recipes:siblings