I am willing to getting treecell to rendering vbox/hbox inside. Where should I start?

[Yonggang Luo]

I am already located the code in
void
nsTreeBodyFrame::PaintCell(int32_t              aRowIndex,
                           nsTreeColumn*        aColumn,
                           const nsRect&        aCellRect,
                           nsPresContext*       aPresContext,
                           nsRenderingContext& aRenderingContext,
                           const nsRect&        aDirtyRect,
                           nscoord&             aCurrX,
                           nsPoint              aPt)


from the file nsTreeBodyFrame.cpp

So did this the right place to start?

Because I am totally not familiar with the code here, So I am willing to 
looking for some help.

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