RAD Studio VCL Reference
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TCustomTreeView.OnExpanding Event
TCustomTreeView Class | TCustomTreeView Members | ComCtrls Namespace | Description | See Also
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Occurs when a node is about to be expanded.

Pascal
property OnExpanding: TTVExpandingEvent;
C++
__property TTVExpandingEvent OnExpanding;
Description

Write an OnExpanding event handler to determine whether a node can be expanded. Set the AllowExpansion parameter to false to prevent the node from expanding. 

 

See Also
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