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TDesignerObjTree Properties, TDesignerObjTree Class
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TDesignerObjTree.OnExpanding Property
TDesignerObjTree Properties | TDesignerObjTree Class
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Occurs when a node is about to be expanded.

property 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.

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