dendrograms

Hello all,
  I am using libraries (mva,cluster) to produce dendrograms.  With 1000 
examples the dendrogram gets too crowded, and i am wondering whether there 
is an option (which i cannot find) to set the number of leaf nodes, like 
in matlab, and return the plot and the assignment map examples -> leaf 
nodes.  Any suggestion is appreciated.  Thanks
Edo