New answers tagged hierarchy
An alternative is a menu with different stages : download bmml source – Wireframes created with Balsamiq Mockups
It seems really odd to have a hierarchy all on one line - it makes it look like the sub-items (a1, a2, b1, b2, etc) are on the same level as the category (A or B). I would use a tree navigation, like this: Closed state: A B Opened out version: A a1 a1a a1b a1c a1d a2 a2a a2b a2c a2d a3 a3a a3b a3c a3d B b1 b1a b1b b1c b1d b2 b2a ...
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