Accordion creationPolicy="all" effect on tree expand

facing very strange problem
i have placed 2-3 tree component inside Accordion container.
On each tree's creationComplete i called function to expand first level.
when I set creationPolicy of Accordion to "all", tree expand is not working.
and if I removed creationPolicy from Accordion, all trees are expand to first level at creationComplete but only tree will not expanded.
and idea why this happen?

Your trees' creationComplete routines are being called at an earlier time than they were before.  So maybe something isn't set up yet that they depend on.

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