[R] Heatmap colored dendrogram

[joonR]

Hi, 
I searched for similar topics but never found what i'm looking for.

I'm looking for something simple to color sub branches of a dendrogram
selectively.
To be better explain:

I have an heatmap (generate with heatmap.2) and its dendrogram object,

now I want to highlight a branch, 
e.g. dend=hm$colDendrogram[[2]][[1]],
by coloring it in red.

Any ideas on how can I do that? 

Thanks for your help guys!

g
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