RAD Studio VCL Reference
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TTreeView.ShowButtons Property

Specifies whether to display plus (+) and minus (-) buttons to the left side of each parent item.

Pascal
property ShowButtons: Boolean;
C++
__property Boolean ShowButtons;

If ShowButtons is true, a button will appear to the left of each parent item. The user can click the button to expand or collapse the child items as an alternative to double-clicking the parent item. 

 

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