OK, sorry.
So, the thing is to make the NodeInfo for your leaf use a different Cell
than the other non-leaf nodes. In the Showcase sample, in
ContactTreeViewModel, notice how the getNodeInfo tests the type of the
parent value (either 'null' denoting the root node, or a Category node, or
a LetterCount node) to choose how to build the DefaultNodeInfo to be
returned (children of the root node are categories, rendered using the
CategoryCell; children of a category are letter-counts, rendered using a
LetterCountCell; etc.)
Finally, the cell used to render individual contacts (leaf nodes), is built
in the ContactTreeViewModel's constructor, as a CompositeCell composed of a
CheckboxCell and a ContactCell; with the CompositeCell itself using some
custom rendering to put each "sub-cell" into a table cell ("td" element
within a <table><tr>)
Does it help?
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