Is there a better way to show simple trees at varying levels of collapse and expansion ?

Subgraphs seem unsuitable - turning a sub-tree into a subgraph changes its position in the sibling sequence used by automatic layout. Also subgraph labels seem to remain visible regardless of collapse state.

Placing successive generations/levels of the tree on different layers (and toggling the visibility of these layers) seems better but a little complex ...

[links between shapes are hidden intelligently, and auto-layout adapts quite gracefully, but time (or Applescript automation) seems to be required to set up all the layers.]

Is there something simpler that I am missing ?

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