You might need to raise a jira for this. There's a TODO in the TreeNode
source:
// TODO: Some way to influence the rendered output (i.e., to display
different icons based on file type).

As a workaround, you could hide the existing icons and provide "label" and
"value" parameters to the tree. The tree will update the "value" binding for
each node and use the "label" block to draw each tree node.



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