beamer and tikz mindmap

hi,

I am trying to use tikz mindmap inside beamer presentation. By default
the graph is too large to fit inside a slide. Hence I put a scale=0.4
in the option of tikz environment. Quite contrary to what intuitively
it should do, tikz generates graph with overlapped root node and other
concept node. It looks like that only the branches connecting the root
node and other concept nodes get scaled. What I want is to scale
everything properly. Is there an easy way to do it?

The other way is non convenient neither: generate graph separately and
then insert it in the presentation. The white margins around the
mindmap makes it hard to align the graph on the slide.

--

-- 
Michael Chen

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