Sideways Tree or Organizational Chart component?

I’ve got a client that wants an app that will allow users to build something almost identical to an organization chart, dragging information blocks (tree nodes) and attaching them to higher tiered nodes (which are themselves info blocks) and rearranging branches as required. The client doesn’t have nearly enough budget for us to construct the chart component from scratch so I’m hoping to find a readymade AS3 component that will work with some tweeks.

I’ve looked at advancedTree and it’s close but works like a conventional tree, with tiers arranged left to right instead of top to bottom. Anyone have other suggestions on components that might work?