Default value: Chevron
This option defines the appearance of the icon used for expanding/collapsing the nodes in a hierarchy tree. It provides three options to choose from:
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Chevron: This displays an arrow button for expanding/collapsing the nodes
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Plus/Minus: This displays a plus/minus button for expanding/collapsing the nodes
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Caret: This displays a button in the form of small triangle for expanding/collapsing the nodes.
