[R] how to select a node in dendrogram/tree

[Zhesi He]

Dear R-users,

Can someone help me select a node/ nodes in a dendrogram or tree, like 
colouring the ones that are selected?

Also, I'm quite interested in any kind of interactive expandable 
dendrogram (like showing different levels of details at a time). I have 
a pretty large dataset and I really want to interact with the graph.

Thanks indeed.

___________________________________________________

Zhesi He
Computational Biology Laboratory, University of York
York YO10 5YW, U.K.
Phone:  +44-(0)1904-328279
Email:  zh107 at york.ac.uk